Decimation is the name of the late 2005 Marvel Comics storyline spinning out of the House of M limited series, that focuses on the ramifications of the Scarlet Witch's stripping nearly all of the mutant population of their powers, reducing a society of millions to one of scant hundreds.

This event, which occurred on November 2 according to X-Men (vol. 2) #191, is known as "M-Day" in the Marvel Universe.

Overview

"Decimation" began with the self-titled one-shot Decimation: House of M: The Day After, and heralded the relaunch of the Excalibur team in New Excalibur, focusing on Pete Wisdom looking for Captain Britain to head up a new British super team, as well as the relaunch of X-Factor from the MadroX miniseries. It also includes several mini-series - Son of M starring a depowered Quicksilver, Generation M focusing on other depowered characters, Sentinel Squad O*N*E showing the latest iteration of the mutant-hunting Sentinels to be robots piloted by humans, X-Men: Deadly Genesis, and X-Men: The 198 - and continues throughout the Marvel Universe, particularly in the X-Men-related titles. One consequence is an upswing of anti-mutant sentiment, especially among certain religious groups, who consider M-Day to be God's judgment against mutant kind.

It has been confirmed by various sources that there are considerably more than 198 mutants remaining - the number has been referred to as "symbolic" rather than actual, and in The 198 Files is said to be the earliest confirmed number. Numbers for pre-Decimation mutants vary from "over a million" (House of M #8) to 14 million (New X-Men #115, where it is said that the 16 million mutants who died on Genosha was around "over half" of the estimated global mutant population of 30 million mutants), giving a population, if the commonly-used 90% depowered figure is true, of between one hundred thousand and one and a half million. Based on the mathematical comparisons of the oft-repeated 198 and several million, Marvel has recently reevaluated the 90% figure into "Over 99%". This is shown in Civil War: Battle Damage Report when Iron Man comments on the Post-CW world. The figure may be reevaluated again depending on events taking place in the upcoming Endangered Species and Messiah Complex storylines.

Both Hank Pym and Beast note shortly after the event that it is impossible for the energy that certain mutants controlled to simply have vanished, and that it must have been "sent" somewhere. As would later be revealed in New Avengers, most of this energy became a sentient entity called "The Collective", who has since come into violent conflict with the Avengers. In addition, a portion of the energy revived the body of Gabriel Summers, who had been trapped in space for many years following the defeat of Krakoa.

Criticism

According to Marvel Editor-In-Chief, Joe Quesada, the Decimation event was designed to reduce the number of mutant characters in the Marvel Universe as he felt the number of mutants had gotten out of hand after forty years of publishing. Most criticisms by fans have been aimed at inconsistencies regarding the roster of mutants who retained their powers after the event. For example, in the Generation M mini-series, several characters were considered depowered, even though they retained their physical mutations. The Civil War Files one-shot revealed that the US government's assessment of the number of mutants on Earth may not be accurate, which allowed Marvel to change the number of depowered mutants. Additionally, characters such as Namor and the Great Lakes Avengers, who are described as mutants but not particularly tied to the X-Men series of books, have not been affected by the event.

Notable depowered mutants

Wizard magazine published a speculative list of supposedly-decimated characters, which Marvel Comics dismissed as including a number of mutants who still have their powers and also includes non-mutant characters. The list therefore should not be trusted.

Mutants who remain active while depowered or have not been confirmed repowered

Mutants who got their powers back

Mutants who were remutated

Depowered mutants who are dead

Mutants who are dead but were repowered at the time

Mutants who are dead but were remutated at the time

Character	Real name	Notes
Revealed in House of M #8
Mirage	Danielle Moonstar	Illusionist. Fired from the Xavier Institute by Emma Frost after she was depowered. Training Trauma in the Initiative Program until fired by Henry Peter Gyrich.
Magneto	Max Eisenhardt	Magnetic Powers; While depowered, he has gained a special suit from the High Evolutionary that replicates his powers. The two currently are working towards a shared, unknown agenda.
Tag	Brian Cruz	Repeller. Died in the bus explosion at the end of New X-Men, volume 2 #23.
Wind Dancer, now Renascence	Sofia Mantega	Wind manipulator. Left the institute in New X-Men, volume 2 #24. Appearing in New Warriors, volume 4.
Revealed in Decimation: House of M: The Day After
Aurelie Sabayon	Aurelie Sabayon	Husk called her parents to inform them that she couldn't breathe under water anymore, however she was never shown.
Blob	Frederick J. Dukes	Attempted suicide after depowerment, as his excess skin was still present. Recently joined up with X-Cell.
Callisto	??	Superhuman senses. Leader of the Morlocks. Temporarily repowered due to the Terrigen Mists but to the point where even rain harms her. Reappears in the pages of X-Factor.
Feral	Maria Callasantos	Feline humanoid. Thornn's sister. Killed by Sabertooth in Wolverine Vol. 3, #54. Not actually repowered but altered to look feline again.
Hanna Levy	Hannah Levy	Had a prehensile tongue and required diet of insects.
Jubilee, now Wondra	Jubilation Lee	Fireworks discharger. Former member of Generation X. Now a member of the New Warriors as Wondra.
Quicksilver	Pietro Django Maximoff	Lost his previous speedster powers, but has received time-travel powers from the Terrigen Mists, and has internalized the mists' power to mutate. Later he got his mutant powers back.
Thornn	Lucia Callasantos	Feline humanoid. Feral's sister.
Revealed in New X-Men, volume 2
Aero	Melody Guthrie	Flyer with energy aura. Revealed in #20.
Amber	Amber	Young girl. Revealed in #28. Died following the bus explosion.
DJ	Mark Sheppard	Energy discharger based on music. Revealed in #23. Died following the bus explosion.
Dryad	Callie Betto	Plant manipulator. Revealed in #23. Died in the bus explosion.
Hydro	Floyd Carter	Aquatic Adaption. Revealed in #20. Accidentally drowned himself when his powers were removed after M-Day.
Jeffrey Garrett	Jeffrey Garrett	Teleporter who got stuck in ghost form during Xorn's attack on the school in New X-Men #147. Revealed in #21. The M-Day left him totally dead.
Network	Sarah Vale	Machine controller. Revealed in #23. Died in the bus explosion.
Preview	Jessica "Jessie" Vale	Precog. Revealed in #20. Depowered yet alive.
Prodigy	David Alleyne	Knowledge Absorption. Revealed in #20. Was asked to stay at the school following the bus explosion. Though still depowered, all knowledge he once absorbed (revealed to be still present in his subconscious mind) has been restored to him telepathically by the Stepford Cuckoos in #43, and he is once again a full member of the New X-Men.
Rubbermaid	Andrea Margulies	Elastic body. Revealed in #23. Died in the bus explosion.
Specter	Dallas Gibson	Shadow form. Revealed in #20. According to Chris Yost and Craig Kyle, he is still alive and living with his grandfather.
Revealed in Mutopia X #5
Armena Ortega	Armena Ortega	Could create protective bubble while sleeping.
Bugman	??	Had iridescent yellow eyes, green skin, small antennas on his head.
The Juicers	??	The male had chameleonic skin, while the female could generate luminescent orbs from her hand.
Lara the Illusionist	Lara King	Could generate illusion which affects all five senses.
Revealed in Generation M
Chamber, now Decibel	Jonothon Evan Starsmore	Revealed in Generation-M #1; was on life support in hospital. Received a transfusion of the blood of Apocalypse which gave him sonic powers and subsequently joined the New Warriors.
Ned Ralston	Ned Ralston	Flight in dragon-like form. Revealed in Generation-M #1; still had his dragon form, but crashed to the ground in mid-flight when he can no longer stay aloft.
Gary Paterson	Gary Paterson	Aquatic adaption in amphibious form. Revealed in Generation-M #1; drowned after the loss of his gills, but still was in his aquatic form at the time.
Tony Romeo	Tony Romeo	Pyrokinesis. Revealed in Generation-M #1; combusted after the loss of powers.
Jeannie Martin	Jeannie Martin	Revealed in Generation-M #1; forty inch neck snapped when it can no longer support the weight of her head.
Latonya Jefferson	Latonya Jefferson	Impenetrable skin. Revealed in Generation-M #1; killed in Generation-M #2 by the Ghoul.
John Mairs	John Mairs	Telepathic third eye. Revealed in Generation-M #2; killed by the Ghoul.
Roach	Hubie Edge	Transforms into humanoid cockroach. Revealed in Generation-M #2; killed by the Ghoul.
Dezmond Harris	Dezmond Harris	Leaping. Revealed in Generation-M #2.
Dynamite	Susan Svenson	Generates light from hands. Revealed in Generation-M #2; killed by the Ghoul.
Stacy X, now Ripcord	Miranda Leevald	Revealed in Generation-M #2. Lived on the streets as a prostitute again until she joined the New Warriors.
Tim Hacker	Tim Hacker	Blue skin and six fingers on each hand. Revealed in Generation-M #2; killed by the Ghoul.
Former Order of Mutants	Kevin E, Bertram K, Michael, Ralph and Joey V	Revealed in Generation M #3. Association of former mutants, although a member, Elaine is only pretending to have been a mutant.
Nelson Cragg	Nelson Cragg	Revealed in Generation-M #3; one of Ravencroft Asylum’s inmates.
Violet Sanchez	Violet Sanchez	Revealed in Generation-M #3; looks like a Shar Pei, killed by the Ghoul.
Sarah Purser	Sarah Purser	Flight. Revealed in Generation-M #4; committed suicide.
Jim Prindle	Jim Prindle	Transforms matter into anything. Revealed in Generation-M #4; Ex-student at Xavier's.
Unnamed Mutants	???	Revealed in Generation-M #2-4; most of them were killed by the Ghoul.
Revealed in Son of M
Hub	??	Teleporter. Member of Unus' Gang and Chimere's ally. Revealed in Son of M #5. Temporarily repowered by the Terrigen Mists with erratic control.
Hack	??	Telepath. Member of Unus' Gang and Chimere's ally. Revealed in Son of M #5. Temporarily repowered by the Terrigen Mists.
Purge	??	Super-strong. Chimere's ally. Revealed in Son of M #5. Temporarily repowered by the Terrigen Mists with erratic control.
Shola Inkosi	Shola Inkosi	Telekinetic. Helped Shadowcat during Mekanix. Ally of Professor X on Genosha. Revealed in Son of M #5. Temporarily repowered by the Terrigen Mists.
Wicked	??	Necromancer. Ally of Professor X on Genosha. Revealed in Son of M #5. Temporarily repowered by the Terrigen Mists with erratic control.
Freakshow	??	Shapeshifter. Member of the Genoshan Excalibur. Ally of Professor X on Genosha. Revealed in Son of M #5. Temporarily repowered by the Terrigen Mists.
Revealed in New Avengers #18-20
Agent Zero	Christoph David Nord	Weapon X Agent
Angel Dust	Christine	Morlock
Artie Maddicks	Arthur Maddicks	Member of Generation X and X-Factor.
Arturo Falcone	Arturo Falcone	Resided in Mutant Town.
Black Tom Cassidy	Thomas Samuel Eamon Cassidy	Banshee's cousin. May have only lost his secondary mutation which transformed him into a tree-like creature.
Blind Faith	Alexis Garnoff	Russian Exiles.
Boost	??	Morlock.
Bora	??	Avant Guard's.
Brass	Sean Watanabe	Telepath.
Caiman	??	Ally of Unus.
Conquistador	Miguel Provenza
El Aguila	Alejandro Montoya
Fatale	"Pamela Greenwood"	Lackey of Dark Beast.
Flambè	??	Member of the Hell's Belles.
Forearm	Jorge Lukas	Student at Xavier's. (Not to be confused with the Mutant Liberation Front member.)
Gloom	??	Ex-student at Xavier's.
Golden Child	Paul Patterson	Appeared in the Marvel Team-Up arc "Golden Child"
Harpoon	Kodiak Noatak	Marauder.
Hazard	Carter Alexander Ryking	Became even more mentally unstable and later dies as he had predicted
Jon Spectre	Jon Spectre	Six Pack member.
Key	??	Cable ally.
King Bedlam	Christopher Terrence Aaronson	Leader of New Hellions.
Kiwi Black	??	Half-brother of Nightcrawler and Abyss.
Lightning Rod	??	Ally of Unus.
Longneck	Jonah Van Helsking	Ex-student at Xavier's.
Mary Zero	Mary	Sidekick of Agent X.
Mist Mistress	??	Member of the Resistants
Monsoon	Aloba Dastoor	Brother of Haven.
Murmur	Arlette Truffaut	Member of Alpha Flight
Murmur II	??	Member of Emplate's Hellions.
Nightwind	??	Rising Sons member.
Overrider	Richard Rennsalaer
Paralyzer	Randall Darby	Member of the Resistants. Also known as Shocker II.
Phantazia	Eileen Harsaw	Brotherhood of Evil Mutants member.
Postman	David	Morlock.
Quill	??	Resistants member (not to be confused with the Xavier Institute student Quill).
Radian, now Phaser	Christian Cood	Ex-student at Xavier's and member of the Omega Gang. Joined the New Warriors.
Radius	Jared Corbo	Brother of Flex. Member of Alpha Flight.
Randall Shire	Randall Shire	???
Reaper	Pantu Hurageb	Mutant Liberation Front member.
Redneck, now Skybolt	Vincent Stewart	Ex-student at Xavier's and member of the Omega Gang. Joined the New Warriors.
Scanner	Sarah Ryall	Acolyte of Magneto.
Shatter	??	Morlock.
Skywalker	??	Ex-student at Xavier's.
Slick	??	Ex-student at Xavier's. Possibly died due to Stryker's attack.
Spike	??	Student at Xavier's.
Spoilsport	??	Rising Sons member.
Strobe	??	Mutant Liberation Front member.
Sunfire	Shiro Yashida	Listed but not pictured.
Tantra	Reuben	Sexual drive activation in elephant-like form. Ex-student at Xavier's.
Tarot	Marie-Ange Colbert	Member of the Hellions, latterly undead.
Tattoo, later Longstrike	Christine Cood	Ex-student at Xavier's and member of the Omega Gang. Joined the New Warriors and was killed by the new Zodiac team.
Tether	??	Morlock.
Tremolo	??	Member of the Hell's Belles.
Vague	??	Member of the Hell's Belles.
Wild Child	Kyle Gibney	Weapon X and X-Factor member.
Wildside	Richard Gill	Mutant Liberation Front member.
Windshear	Colin Ashworth Hume	Alpha Flight member.
Wiz Kid	Takeshi "Taki" Matsuya	Member of the X-Terminators.
Wraith	Hector Mendoza	Member of the X-Men. Had transparent skin.
Shen Xorn	Shen Xorn	Kuan-Yin's twin brother. Member of the X-Men.
Zach	Zach	Ex-student at Xavier's.
Revealed in various other issues
Abyss	Nils Styger	Nightcrawler's half-brother. Revealed in the Official Handbook of the Marvel Universe A to Z #1.
Alexander Lexington	Alexander Lexington	Member of Sentinel Squad O*N*E. Revealed in X-Men: The 198 Files (NB: The Sentinel Squad O*N*E miniseries takes place pre-M-Day, and shows how the squad was formed), possibly killed during the Nanotech takeover of the Sentinels who attack the X-Mansion.
Tempest	Angel Salvadore	Human/Bug mutation. Revealed in Exiles #72. Ex-student at Xavier's. Now a New Warrior using technology to allow herself to fly and throw ice/fire blasts.
Antonio	Antonio	Revealed in X-Men: The 198 #1. Lover of Magma, fire powers. Died when exploring a volcano at the moment of the Decimation.
Bandit, now Night Thrasher	Donyell Taylor	Revealed in New Warriors #7
Beak, now Blackwing	Barnell Bohusk	Bird mutation. Revealed in Exiles #72 and slowly reverted to a more hunky form. Ex-student at Xavier's. Now a New Warrior using technology to allow himself to fly
Five of the Bohusk/Salvatore Children	Kara, Axel and three unnamed kids	Revealed in Exiles #72 that 5 of the 6 children are depowered. Tito Bohusk is the only one who has retained his mutated appearance.
Bloodlust	Beatta Dubiel	Revealed in Official Handbook A-Z #4. Member of the Femme Fatals.
Book	Annika	Genoshan librarian. Revealed in Marvel: Atlas #2. Repository of all human knowledge.
Broadband	??	Genoshan. Revealed in Marvel: Atlas #2. Was able to access all manner of electronic communications and project them to others.
Delphi	??	Revealed in Uncanny X-Men #490. Morlock.
Doctor Leery	Leery	Revealed in X-Factor vol. 3 #5. Slain by Rictor.
Elijah Cross	Elijah Cross	Mass-increasing. Revealed in X-Factor vol. 3 #17. Is the leader of the X-Cell. Exploded from the side-effects of the Terrigen Mists
Gazer	??	Revealed in X-Men #178. Has been turned into a Horseman of Apocalypse in #182.
Flex	Adrian Corbo	Ex-Alpha Flight member. Brother to Radius. Revealed in All-New OHotMU A-Z Update #3.
Jebediah Guthrie	Jebediah Guthrie	Electrical discharge. Revealed in "Endangered Species" Ch. 12 (New X-Men #42).
Marrow	Sarah	Revealed in X-Factor III #18; Shown as a member of the group of former mutants calling themselves "X-Cell," who believe the government is behind the massive loss of mutant powers.
Maximus Lobo	Maximus Lobo	Werewolf with enhanced senses. Member of the Dominant Species. Revealed in Young X-Men #1.
Mesmero	Vincent	Hypnotist. Revealed in X-Men Unlimited, volume 2 #13
Mister Marvel	Mark Hawkins	Revealed in X-Men Unlimited, volume 2 #13. Had the power to have a wonderful super-hero life.
Mulholland Black	Mulholland Black	Transforms the psychic energy from Los Angeles into pure kinetic power. Revealed in The Order #8. Former member of the Black Dahlias. Repowered as a member of The Order.
Pasco	Pasco	Forcefield generation. Mercenary and partner of Sabretooth. Introduced in X-Men #191.
Percival Fellows	Percival B. Fellows	Revealed in Uncanny X-Men #489. Former friend/ally of Magneto. After the M-Day, died under unrevealed circumstances.
Polaris	Lorna Dane	Magnetic Abilities. Revealed in X-Men, volume 2 #177. Repowered by Apocalypse as Pestilence, one of his Horsemen.
Professor X	Charles Francis Xavier	Telepath. Revealed in X-Men: Deadly Genesis #5. Spinal injury repaired in the process. Recently repowered by The M'Kraan Crystal. Accidentally shot by Bishop and gravely injured but still alive.
Quiet Bill	??	Can open portals to view alternate realities and timelines. Revealed in X-Men #200. Homeless man who first appeared in Gambit Vol. 3 #10.
Qwerty	??	Precognitive. Morlock. Revealed in Uncanny X-Men #490.
Razorback	Buford T. Hollis	Innate ability to operate and drive any vehicle. Revealed in All-New Official Handbook Of The Marvel Universe A-Z #9.
Rictor	Julio Esteban Richter	Seismic Waves. Revealed in X-Factor, volume 3 #1.
Scarlet Knights	Arthur, Lisa, Colin, Jennifer, Malcolm, Edward "Ned" and Nell Hardy	Revealed in New Excalibur #6. Family of flying mutants depowered in mid-flight.
Shadow Captains	Derek, Ricky and Petrie	Revealed in New Excalibur #20. All but Sage and Lionheart were depowered mutants according to Ablion.
Unus the Untouchable	Angelo Unuscione	Revealed in Marvel Legacy: The 1960s under the Factor Three entry. Was in Genosha when Pietro arrived with the Terrigen Mists. Killed by his new forcefield.

Notes:

• Domina, Electric Eve, Revenant, Toad-In-Waiting are presumed depowered following Wizard's list but haven't been confirmed on panel.
• Sunfire, while depowered long before M-Day because of Rogue was listed among the energies in the Collective. Seeing that Rogue still has his powers how this is possible remains unknown.
• It is not clear which powers Black Tom Cassidy has lost. While he has surely lost his tree form/plant control power, he may have only been mimicking his energy power against New Excalibur as it was said he used Black Air technology.
• According to the New Official Handbook of the Marvel Universe A-Z #12 Wild Child may have retained some of his powers since he gained some of them through genetic manipulation during his Alpha Flight and Weapon X days.
• The only students at Xavier's who are still powered were shown in New X-Men vol. 2, #23. That means that despite not being shown on panel Kidogo, Flubber and Rain Boy are depowered. Any other student but the ones listed either here or in the powered section either died prior to M-Day or are depowered. The ones who died on the bus weren't shown before (Amber for instance) except for DJ, Dryad, Network, Rubbermaid, Tag.
• Many mutants still remain active although they are depowered, they include the New Warriors Blackwing, Tempest, Wondra and Wind Dancer, the X-Cell as well as Brass and El Aguila as reported in Civil War: Battle Damage Report
• It has been revealed in the "Endgangered Species" storyline that latent mutants, such as Charlotte Jones, have also lost their X-gene after M-Day.
• It appears that some characters, for an as of yet unexplained reason, have reverted to normal at a slower rate than others. This includes Beak, Stacy X, Marrow (who still isn't normal) and Ned Raltson. It is unknown if Irving, Doug & Jerry belong to this category or if they are still mutants.
• Callisto, Freakshow, Hub, Hack, Purge, Shola Inkosi, Wicked and Unus have all been repowered by the Terrigen Mists in the Son of M limited series but the effects were temporary. Unus was suffocated by his own powers while Callisto was in a coma. She has since recovered.
• Iceman is not repowered, since he never lost his powers in the first place. After the events of M-Day he developed a mental block, which suppressed his secondary mutation and blocked his powers.
• Archangel only pretended to be depowered as seen in Generation M #4 and #5.
• It is unclear as to if Layla Miller had powers before M-day, or if she was simply lying. To further complicate matters, she was said to not be a mutant in X-Factor III #20.
• Feral and Thornn weren't actually repowered, they merely had their physical mutation restored. As shown in Wolverine #55.

Confirmed remaining mutants

While it has been stated that there are at least 198 remaining mutants, according to Henry Peter Gyrich, there are actually "around 300"; the 198 number is merely the number of mutants the US government has cataloged, with a 199th mutant being off the record. 197 mutants have currently been confirmed within actual story material to still have their mutant X-Gene, though several of them were not present during M-Day to be affected. 24 of said mutants have died post-Decimation, including 2 unknown mutants. The confirmed remaining mutants are as follows:

Alchemy Anole Apocalypse Archangel Arclight Armor Asylum Aurora Avalanche Banshee (deceased) Beast Beautiful Dreamer Big Bertha Bishop Black Box (deceased) Black Womb Blindfold Bling! Bliss Blockbuster (deceased) Bohusk, Tito Boom Boom Braddock, Jamie (deceased) Cable Caliban (deceased) Cannonball Catiana Cheney, Lila Cloak Collective Man (Chang) Collective Man (Han) Collective Man (Ho) Collective Man (Lin) Collective Man (Sun) Colossus Cyber Cyclops Dagger Daken Dark Beast Darwin Dazzler Dee, Johnny Diamond Lil Domino Doorman Dragoness Dust Elixir

Empath Erg Exodus Fever Pitch Firestar Flatman Forge Frenzy Frost, Emma Gambit Gargouille Gateway (presumed deceased) Gentle Ghoul (deceased) Glob Herman Greymalkin Guardian Havok Hayes, Molly Hellion Husk Icarus (deceased) Iceman Indra Ink Jazz (deceased) Jeffries, Madison Justice Karma Kid Omega (incorporeal) Kraven the Hunter Kylun Lady Mastermind (presumed deceased) Landru, Matt (deceased) Leech Lifeguard Lightbright Lil Bro Litterbug Loa M Mad Jim Jaspers Magik Magma Mammomax (deceased) Mandrill Marvel Girl Masque

Mastermind Match Mentallo Mercury Messiah Complex Baby Microbe (deceased) Micromax Mindblast Mister Immortal Mister M (deceased/evolved) Multiple Man Mutant Zero Mysterio III (presumed deceased) Mystique Namor the Sub-Mariner Namora Namorita (deceased) Nekra Neophyte Nightcrawler Nixon, Kiden No-Girl Nocturne Northstar Nuwa Omega Red Onyxx Outlaw Owl Peepers (deceased) Persuasion Pixie Portal Prism (deceased) Profile Projector Psylocke Puck (deceased) Pulse Quill (deceased) Random Rasputin, Mikhail Rhapsody Richards, Franklin Ricochet Riptide Rockslide Rogue Sabra Sabretooth (deceased) Sack

Sage Scalphunter Scrambler (deceased) Selene Senyaka Shadowcat (M.I.A. - assumed dead) Shatterstar Shaw, Sebastian Shaw, Shinobi Silver Samurai Siryn Skein Skids Slade, Frederick Smerdyakov, Gregor Soul, Bobby Squirrel Girl Storm Strong Guy Sugar Man Sunpyre Sunspot Surge Tempo Thousand-in-One (deceased) Three-in-One (Celeste) Three-in-One (Mindee) Three-in-One (Phoebe) Thunderbird Toad Trance Travis, Lorelei Tryp, Damian Unuscione Ursa Major Vanisher Vanguard Vindaloo Voght, Amelia Vulcan Wallflower (deceased) Warpath Whedon, Evangeline Whirlwind Wisdom, Pete Wither Wolf Cub (deceased) Wolfsbane Wolverine X-23

• 2 unnamed and unknown mutants murdered and eaten by Predator X in New X-Men vol. 2 #43-44: an American rodent-like mutant and a fire-breathing Canadian male.

Mutants who arrived post-Decimation
The following mutants entered the 616 Marvel universe post-Decimation, and thus were unaffected by the decimation:

Shadow-X Angel (deceased) Shadow-X Beast (deceased)

Shadow-X Cyclops (deceased) Shadow-X Iceman (deceased)

Shadow-X Marvel Girl (deceased) Shadow-X Professor X (deceased)

Shadow King (deceased)

Notes:

• All of the mutants from alternate timelines who entered the 616 universe pre-Decimation are powered according to X-Men: Endangered Species. This includes Bishop, Blaquesmith, Dark Beast, Gaia, Marvel Girl, Mountjoy, Nocturne, Sugar Man, Big Hero Six's Sunpyre, Damian Tryp and The Witness (deceased). While still a mutant, Cable does not belong to that list as he was born on Earth 616 as the son of Madelyne Pryor and Scott Summers and only raised in an alternate timeline. It is unknown if Archer and Fixxretained their mutant abilities after M-Day, or if they even currently are still operating in the 616 universe timeline. Nocturne has left 616.
• All five Tao-Yu brothers are confirmed as living as of Civil War: X-Men #01.
• Lady Mastermind (Regan Wyngarde) and Mastermind (Martinique Jason) are half-sisters and the daughters of the original Mastermind (Jason Wyngarde).
• It's unclear if Mauraders who died during the Messiah Complex (i.e. Blockbuster, Scrambler, Prism) will return, as technically Sinister may still obtain the ability to clone them

Unconfirmed mutants

Mutants whose official mutant status has not been confirmed since M-Day. Current Marvel policy is to suspect the following mutants powered until official confirmation, especially the ones who were listed in an Official Handbook of the Marvel Universe A-Z and not stated as depowered.

Character	Real name	Notes
Aardwolf	Chon Li	Ability to turn into a werewolf-like creature. Former employer of the Folding Circle.
Anais	Anais	Worshipper of Apocalypse.
Astra	Astra	Last seen in a flashback in The Twelve storyline. Possibly killed by Apocalypse.
Azazel	Azazel	Father of Nightcrawler. Trapped in an alternate dimension
Barnacle	Mortimer Everett	Former member of the Acolytes.
Base	Hiro Sokuto	Member of Genetix.
Bella Donna	Bella Donna Boudreaux	Last seen in a relationship with Bandit and still leader of the Unified Guilds of New Orleans.
Blindspot	Unrevealed	Last seen in Rogue Vol. 3.
Astrid Bloom	Astrid Bloom	Last seen in Emma Frost series. Former friend of Emma Frost.
Elias Bogan	Elias Bogan	Last seen in X-Treme X-Men. Former member of the Hellfire Club.
Briquette	Unrevealed	Sole Hell's Belles' member not confirmed to be depowered.
Burner	Byron Calley	Former member of the Resistants.
Chance	Unrevealed	Former member of the Fallen Angels.
Chimera	Unrevealed	Wolverine's enemy.
Courier	Jacob Gavin Jr., "Jacklynn"	Ally of Gambit.
Cowboy	Luke Merriweather	Member of the Thunderiders
Crimson Commando	Frank Bohannon	Last seen as a bodyguard of Magneto's in the House of M.
Doppleganger	Wolfgang Helmut Heinreich	X-Factor's enemy.
Dragonwing	Unrevealed	Last seen in Generation X #54. Was leader of the Rising Sons.
Double Helix	Unrevealed	Member of the London Morlocks.
Electric Eve	Eve	Last seen in Morlocks Vol 1.
Emplate	Marius St. Croix	Last seen in Generation X.
Ent	Unrevealed	Last seen in Web of Spider-Man #77
Ever	Unrevealed	Former Morlock and member of the Brotherhood of Mutants.
Famine	Autumn Rolfson	Member of the original Horsemen of Apocalypse.
Feedback	Albert Louis	Beta Flight team member.
Fontanelle	Gloria Dayne	Ally of Gambit
Cordelia Frost	Cordelia Frost	Youngest sister of Emma Frost.
Sean Garrison	Sean Garrison	Father of Wallflower.
Carter Ghazikhanian	Carter Ghazikhanian	Last seen leaving the X-Mansion after Exodus' Brotherhood of Mutants attacked the school.
Ghost Girl	Lili Stephens	Former member of Alpha Flight.
Mikula Golubev	Mikula Golubev	Member of Bogatyri.
Gorgeous George	George Blair	Member of the Nasty Boys. Last seen in X-Factor Vol.1
Hairbag	Michael Suggs	Member of the Nasty Boys.
Harness	Erika Benson	Agent of Alliance of Evil and A.I.M..
Hawkshaw	Unrevealed	Member of the Press Gang.
Holly	Holly	X-Corporation's secretary.
Honcho	James MacDonald	Thunderiders
Inza	Inza	Peruvian mutant.
Shirow Ishihara	Shirow Ishihara	Ally of Gambit.
Jack-in-the-Box	Jack	Last seen in Weapon X.
Jade Dragon	Dei Guan	Ex-member of the Alpha Flight and Mutant Liberation Front.
Kamal	Kamal el Alaqui	Former member of the Acolytes.
Katu	Katu Kath	Former member of the Acolytes.
Benazir Kaur	Benazir Kaur	Ex-member of the Hellfire Club
Benedict Kine	Benedict Kine	Ex-member of the Hellfire Club
Kleinstocks	Harlan Kleinstock	Former Acolyte of Magneto.
Kleinstocks	Sven Kleinstock	Former Acolyte of Magneto.
Lacuna	Woodstock	Last seen in X-Statix.
Carlos Lobo	Carlos Lobo	Last seen in Web of Spider-Man #55.
Manikin	Whitman Knapp	Alpha Flight & Beta Flight member.
Krista Marwan	Krista Marwan	Member of Genetix.
Meld	Jeremiah Muldoon	Sentinel Squad One faked his death prior to M-Day, where he now resides in Ecuador.
Mindmeld	Unrevealed	Bodyguard of Shinobi Shaw
Mr. One & Mr. Two	unrevealed	Former Acolytes of Magneto.
Mister X	Unrevealed	Enemy of Wolverine's
Mondo	Unrevealed	Last seen in Generation X.
M-Twins	Claudette and Nicole St. Croix	Younger twin sisters of M and Emplate
Nanny	Unrevealed	Last seen in Generation X.
Nuklo	Robert Frank Jr.	Son of Whizzer and Miss America
O-Force	Obituary, Ocean, Ocelot, Oink, Ooze, Optoman, Oracle, Orbit, Orchid, Orifice, Overkill, Ozone	All members of the O-Force as seen in X-Statix.
Omerta	Paulie Provenzano	Former member of the X-Men.
Orator	Victor Ludwig	Member of the Acolytes.
Orphan-Maker	Peter	Last seen in Generation X
Paradigm	Unrevealed	Last seen in X-Force Vol.1
Pathway	Laura Dean	Beta Flight member
Reeva Payge	Reeva Page	Ex-Hellfire Club member.
Peace Monger	Dr. Cobbleskill	Rights activist. Enemy of American Eagle.
Pipeline	Cormick Grimshaw	Member of the Press Gang and Genoshan Magistrates.
Primal	Adam Berman	Last seen in Generation X.
Promise	Gene Bitner, Tad Carter, Craig Farnsworth, Simon Lestron, Lucy Robinson, Ernest Scope, Gracie Smith	Group of telepaths.
Puff Adder	Gordon Fraley	Member of the Serpent Society.
Punchout	Unrevealed	Member of the Press Gang.
R. U. Reddy	Winthrop Roan, Jr.	Member of the Thunderriders
Rakkus	David Anthony Rice	Former member of the Acolytes.
Ramrod	Patrick Mahony	Last seen on X-Factor Vol 1.
Red Lotus	Paul Hark	Last seen attempting to destroy the mutant slave ring of the Hellfire Club.
Cecilia Reyes	Dr. Cecilia Reyes	Former X-Man. Last seen at the Neverland mutant concentration camp in Weapon X Vol 3.
Ridge	Unrevealed	Member of Genetix.
Ruckus	Clement Wilson	Last seen as an aid for Mystique.
Sabre	Unrevealed	Member of Mystique's Brotherhood of Mutants.
Scarlet Witch	Wanda Maximoff	The catalyst of M-Day, Wanda has not been confirmed in retaining the X-Gene or not. She has no memory of her being a mutant.
Scribe	Jane Hampshire	Member of the Hellfire Club.
Shepard	Francis Leighton	Former member of X-Corporation and agent of Quiet Man.
Shift	Clifton Joseph	Member of Genetix.
Shooter	Shane Shooter	Last seen in Jubilee #6
Shortpack	Unrevealed	Last seen in Mystique Vol.1
Shrew	Marilyn Maycroft	Member of Hell's Belles.
Shriek	France Louise Barrison	Spider-Man villain
Sirocco	Unrevealed	Member of Desert Sword
Sketch	Unrevealed	Last seen in Uncanny X-Men #383
Slab	Christopher Anderson	Member of the Nasty Boys.
Slither	Aaron Salomon	Snake-like form. Member of the Resistants.
Spoor	Andrew Hamish Graves	Former member of the Acolytes.
Ms. Steed	Emma Steed	Ex-Hellfire Club member
Static	Giana Carina Esperanza	Former member of the Acolytes.
Stinger	Wendy	Member of the Alliance of Evil.
Stinger II	Blodween Reese	Member of Genetix.
Stitch	Jodi Furman	Ex-Alpha Flight member.
Switch	Devon Alomar	Member of King Bedlam's Hellions. Last seen in X-Force Vol.1
Threnody	Melody Jacobs	Lover of X-Man.
Thumbelina	Kristina Anderson	Ex-Mutant Liberation Front member; sister to Slab
Timeshadow	Unrevealed	Member of the Alliance of Evil.
Vesper	Raani Jatwinder	Member of Genetix.
Vincente	Vincente	Former member of the Emplate's Hellions; can shift body into different states of matter.
War	Abraham Kieros	Member of the original Horsemen of Apocalypse.
Wolf	unrevealed	Member of the Thunderiders
Wrench	Leonard Hubb	Member of the Thunderiders
Wyre	Unrevealed	Former member of the Alpha Flight.

Mutants or not

Those characters have all had the origin of their powers put in question at some point. Here is some clarification.

• Mutants, powered:
• Jamie Braddock
• Cloak & Dagger are listed as science/magic-based mutates in Civil War: Battle Damage Report but have otherwise long been established in the main Marvel continuity as latent mutants whose powers were activated by drugs developed by the demon D'Spayre.
• The Owl is indeed a mutant as he used his own dna as the source of his own supply of the contraband drug Mutant Growth Hormone, which was confirmed in the Endangered Species storyline to be derived solely, as it's name suggest, from genetic mutants with the X-genome.
• The Stepford Cuckoos. In the X-Men: Phoenix - Warsong limited series it was revealed that they were actually Weapon XIV of the Weapon Plus Project. With this information also came the revelation that the girls were genetic daughters/clones of Emma Frost. They were harvested from 1000 of her eggs, and they had 995 other mutant siblings (most of which were identical to them, one having two heads). Ultimately at the climax of the story all but the 3 original living Cuckoos perished.
• Mulholland Black was said to be a depowered mutant in The Order #8, but her mutant powers reemerged after losing her artificially granted abilities, in a way that ressembles Iceman's powerloss and return.
• Franklin Richards, technically depowered before M-Day but remains genetic mutants.
• Cable, see above. Has since found a way to mimic his powers through technological means.
• Magik, seen using her mutant ability of teleportation disks in The Quest for Magik storyline in New X-Men, confirming her mutant powers.
• The original Cyber's body died long ago and only his spirit now exists. He is classified as a mutant because he currently lives in the body of the mutant Milo Gunderson.
• Shatterstar, inhabits the body of a mutant, Benjamin Russell (they are physically identical though the exact nature of their connection -whether they be twins, clones, or split-personalities-has yet to be revealed) was listed as a mutant in X-Men: The 198 Files

• Mutants, status unknown:
• The Gibbon has been shown as retaining his physical mutation but showed no sign of his former mutant abilities.
• Irving, see above
• Doug & Jerry, see above
• Clay, appeared on panel but showed no powers
• Dark Mother (deceased), see above
• Scarlet Witch, see above
• Timeslip, see above
• Meld only appeared in a flash-back limited series. It is not known as of yet whether or not he kept his powers, or even if he is still alive.

• Mutants, depowered:
• Brass, The Civil War: Battle Damage Report made no mention of if any mutant referenced remained powered, although several were listed as potential recruits for The Initiative. Plus he is well-trained to fight crime without mutant powers.
• El Aguila, see above
• Harpoon was confirmed depowered in New Avengers #18, but has since reappeared as a member of the Marauders. It is confirmed in X-Men #205 that he is using a technological weapon as Storm is seen using it.
• Black Tom Cassidy was using Black Air technology to mimick his powers in New Excalibur

• Possible latent mutants:
• Mimic, hasn't shown any power since M-Day but was a Thunderbolt detainee, which suggest he had some, was claimed to be a latent mutant whose powers were activated by accidental exposure to experimental gases as a young boy in his father's lab by former head X-writer Scott Lobdell.
• Purple Man gained his after a similar accident since he introduced himself as a mutant when he met X-Man (which he had no real reason to lie about and which was not disputed by Nate Grey when he read his memories), his daughter Purple Girl, who inherited the exact same powers is a confirmed genetic mutant, though numerous mutates have given powers to their children. He is still powered
• The Black Cat had her powers triggered through mechanical means but is unclear whether or not it was a latent mutation, her powers were stripped long before M-Day in exchange for catlike abilities anyway.

• Non mutants:
• Deadpool, got his powers from the Weapon X program
• Juggernaut, got his powers from the Gem of Cyttorak
• Lady Deathstrike, is a cyborg
• Mastermind Excello
• Mister Sinister, experimented on himself to mutate
• Vertigo, Savage Land mutate
• the Folding Circle
• the original members of Psionex are not mutants.
• Sauron, got his powers when bitten by a pterodactyl
• Living Monolith, actually a human whose DNA was artificially spliced with the mutant genomes of Havok by Apocalypse's then servant Mister Sinister.
• Andreas Strucker, powers injected "in vitro" as fetuses during gestation. As such is a mutate and not a genetic mutant.
• Quake, see above
• Yo-Yo Rodriguez, see above
• Raptor, see above
• Ultra Girl is a Kree mutant
• Cassandra Nova, as Professor Xavier's dark twin belongs to the Mummudrai species
• Agent Brand, confirmed to be an alien-hybrid

• Race unknown
• Ernst, in the Here Comes Tomorrow storyline, it was implied Cassandra Nova had been reeducated and transformed into Ernst, and despite later retcons, this has not yet been conclusively disproven, so Ernst can not be considered yet a mutant for now.
• Layla Miller has both confirmed and denied she is a mutant.
• Asp, only feared the Superhuman Registration Act, not the Mutant Registration act. No source has been given to her powers
• Elsa Bloodstone, has powers from a mystical device but could have mutant powers on top of it
• Debrii, no source has been given to her powers
• Boulder, no source has been given to his powers
• Geldoff, see above
• Klara Prast, see above
• Typhoid Mary, see above
• Speed, and Wiccan might be reincarnated children from the Scarlet Witch and as such mutants or mystical creatures created by Mephisto, or not.
• Hollow, It is unknown what it exactly is. Originally explained a prisoner of Emplate, the creature was retconned into being M II imprisoned by Emplate who attacked her and created the Penance shell around her. M II was freed from the Penance shell, and the St. Croix twins went inside it, becoming Penance, in order to make up the wrong that was done to their sister. When they later were freed from the Penance shell, it was discovered that the shell was autonomous. It remains to be seen whether Hollow is a living creature, some mystic device, a magical creation, etc.
• The Isolationist, Peter David has confirmed in an X-Position interview that he is NOT a mutant but something else entirely.

Consequences, repercussions

• The Xavier Institute is no longer just a school for mutants, but a haven for all remaining mutants. This changed after the Civil War as they were all set free by the US president.
• Sentinel Squad O*N*E: In the aftermath of the House of M, resulting in the depowering of 90% of the world's mutant population, the Office of National Emergency (aka O*N*E), a splinter from the Department of Homeland Security, had Sentinels instituted at the X-Mansion to protect the mutants in case any enemies used this low point as an opportunity to attack them at their weakest, and also to stop the mutants in the event of a revolution. The Squad was later destroyed in the events of Messiah Complex.
• Children of the Vault: The reduction of mutants also accidentally awakens The Children of the Vault. (In the pages of X-Men)
• Exodus reforms the Acolytes with Frenzy, Random, Tempo and Carmella Unuscione
• Apocalypse: Due to the events of M-Day, Apocalypse was revived by Cable to force the remaining mutants to band together to expel the threat, as a way to bring the mutant community together after M-Day. (In the pages of X-Men and Cable and Deadpool)

He turned Sunfire, Gambit, Polaris and Gazer into his Horsemen. Gazer was killed by Ozymandias, however, resulting in Polaris and Sunfire regaining powers and Gambit being turned black and having a lethal gas power. The latter two then joined Sinister's forces as did Exodus's forces after discovering that no new mutant had appeared since M-Day.

• The flying energy: It reawakened Vulcan who was a member of a secret team of X-Men sent to help Scott's team on Krakoa and left to die there. He returned from his space exile to begin a vendetta against Xavier and then the Shi'ar Empire (In the pages of Deadly Genesis and Uncanny X-Men).

The rest of the energy ended up forming The Collective by merging with a mutant postal worker, Michael Pointer who then apparently killed the then members of Alpha Flight and went on to Genosha, repowering Magneto, who recognizes the intelligence controlling it as "Xorn who explains his action by the fact that the mutants needed him as a leader. The New Avengers arrive and blast the Collective into the sun. Magneto is then taken away in an helicopter which blows up right after it takes off (In the pages of New Avengers)

• William Stryker: Deeming the sudden massive reduction in number of the mutant population a sign of God, saying "He made the first step and now we have to take the next", basically rallying for genocide on TV. (In the pages of New X-Men)
• Onslaught: Onslaught Reborn will see Onslaught return; as the mutant energies of both Professor X and Magneto meet once again, they reform the monster. (This takes place before the Civil War event).
• Both Professor X and Reaper have been healed by the event. The former can now walk again and the latter is no longer brain dead.
• After the Civil War, X-Factor Investigations will be dealing with a siege in Mutant Town when a group of depowered mutants, calling themselves X-Cell become terrorists thinking the Government is responsible for their depowerment. The members are Elijah Cross, Callisto, Blob, Marrow, Fatale, Reaper, and Abyss.
• Wolverine discovers a half-way home for depowered mutants who are fearing for their lives. Both Jubilee and Maverick are there.
• Dr. Kavita Rao's work is ruined, as there's no more need for a mutant cure and all of her mutant DNA samples were turned to dust on M-Day.
• As a side effect, no new mutants are born. This leads into the Endangered Species storyline, and later, the Messiah Complex.
• Several de-powered mutants seek to return to heroing, and are recruited into the post-Civil War New Warriors.
• Quicksilver ends up in the care of the Inhumans where he starts the Silent War by stealing the crystals of the Terrigen Mists. He then attempts to repower mutants, resulting in many of their injuries and some deaths. See "Son of M"

Collected editions

Trade paperbacks

Title	ISBN	Collects
Decimation: X-Men - The Day After	ISBN 0-7851-1984-1	Decimation: House of M - The Day After and X-Men #177-181.
Decimation: Generation M	ISBN 0-7851-1958-2	Generation M #1-5.
Decimation: Son of M	ISBN 0-7851-1970-1	Son of M #1-6.
Decimation: Sentinel Squad O*N*E	ISBN 0-7851-1997-3	Sentinel Squad O*N*E #1-5.
Decimation: X-Men - 198	ISBN 0-7851-1994-9	X-Men: The 198 #1-5 and X-Men: The 198 Files (one-shot).

Hardcovers

Title	ISBN	Collects
X-Men: Deadly Genesis	ISBN 0-7851-1984-1	X-Men: Deadly Genesis #1-6.
Wolverine: Origins & Endings	ISBN 0-7851-1977-9	Wolverine #36-40.

Bibliography

• Decimation: House of M - The Day After (one-shot)
• Generation M #1-5
• Mutopia X #5
• New Excalibur #1-3
• New X-Men #20-23
• Sentinel Squad O*N*E #1-5
• Son of M #1-6
• Uncanny X-Men #466-468
• Wolverine #36-40
• X-Factor #1-4
• X-Men #177-179
• X-Men: Deadly Genesis #1-6
• X-Men: The 198 #1-5
• X-Men: The 198 Files (one-shot)
• X-Men Unlimited #13
• New Avengers #16-20

Notes

References

External links

• Marvel.com - Official Decimation webpage
• UXN's "Generation M" issue summaries
• Comixfan's list of Marvel's mutants' whereabouts after DeciMation and beyond