The material is usually shown as having been created from the remains of Superman's native planet of Krypton, and generally has detrimental effects on Superman and other Kryptonians. The name "Kryptonite" covers a variety of forms of the substance, but usually refers to the most common "green" form.
The word Kryptonite is also used in modern speech as a synonym for Achilles' heel, the one weakness of an otherwise invulnerable hero.
"Kryptonite" was introduced in 1943 on the Superman radio series, as both a plot device and to allow Superman's actor, Bud Collyer, to occasionally take time off. The substance played a part in at least one major plot-line during the course of the program.
It was not until 1949 that the comic book writers incorporated it into their stories, as both a convenient danger and weakness for Superman and to add an interesting element to his stories. Kryptonite is most commonly depicted as green in coloring, with a few exceptions; it was red in its first appearance in Superman (volume 1) #61 in 1949. When Superman followed the time trail of a piece of red rock that weakened him, he was able to trace his origin back to Krypton for the first time. Other colors of kryptonite, having different effects, began to show up frequently beginning in late 1950s comics, reaching a peak in appearances in 1960s Superman series.
Kryptonite was depicted as being so abundant that many ordinary criminals kept a supply as a precaution against Superman's interference. They kept it hidden so Superman would not be able to steal it and destroy it. In an effort to reduce the use of kryptonite in Superman storylines, all known kryptonite on Earth was transmuted into k-iron in a 1971 storyline, though kryptonite could still be synthetically manufactured by a variety of known and unknown means, and additional material left over from the destruction of Krypton would continue to fall from space.
While quantities of Kryptonite are reduced, the material is still present Post-Crisis, albeit only in its green form. However, through the use of Batman's notes, Ra's al Ghul is able to fashion a synthetic Red Kryptonite. Even after quantities have been reduced there's still a fair amount of Kryptonite available, which prompts Superman-friendly corporations, such as Wayne Enterprises and Kord Industries, to take it upon themselves to round up all remaining pieces so as to make its acquisition by small-time crooks more difficult.
In the recreated Universe Kryptonite is in such abundance that it becomes easily available to ordinary criminals and crooks, as before. Following orders issued by Lex Luthor and Lana Lang, LexCorp starts stockpiling it and selling to government facilities and weapon makers. Superman and Batman embark on a mission to rid Earth of Kryptonite; a mission that almost fails when the cornered Lana Lang launches a large number of dirty Kryptonite warheads, all simultaneously, tainting the whole Earth atmosphere. Hiro Okamura builds and frees a storm of nanobot devised to capture and deactivate the tiniest fragments of Kryptonite.
Once again, as in the 1971 storyline, all Kryptonite is destroyed, the remaining fragments wrapped in lead and hurled into the Sun by Superman himself, save for one fragment, which Superman gives to Batman. However, it is later revealed that Batman has acquired a fair amount of every variety of the alien material, keeping his samples in the Batcave
Under standard chemical naming procedures, the -ite suffix of kryptonite would denote an oxyanion of the element krypton. However, krypton is a noble gas that forms compounds only with great difficulty, and such an oxyanion is not known. (Nevertheless, the University of Leicester presented the Geological Society with krypton difluoride to commemorate the 70th anniversary of Superman )
The term kryptonite instead implies a meteorite from the planet Krypton, as in the Lois and Clark: The New Adventures of Superman episode "The Green, Green Glow of Home", where it is given as "period element 126", which in reality corresponds to unbihexium/eka-plutonium, the most stable of the elements in the so-called island of stability. Superman: The Man of Steel Sourcebook (1992), while non-canon, concurs, referring to kryptonite as "the common ore of the super-actinide kryptonium, an unusually stable transuranic element, whose atomic number is believed to be 126". Kryptonium is given a radioactive half-life of 250,000 years.
In Superman Returns, Lex Luthor steals a fragment of kryptonite from a Metropolis museum, where it is on display under the title 'Sodium lithium boron silicate hydroxide with fluorine'. As borosilicate glass is commonly crystalline and green-tinted, this could be a plausible human mis-identification of kryptonite; alternately, as no 'unknown' component is listed, one might assume this blend to be the actual composition of green kryptonite. Real sodium lithium boron silicate hydroxide (without fluorine), Jadarite, was discovered in a Serbian mine in April 2007, and takes the form of a white powder rather than large green crystals.
In Superman: The Movie, Lex Luthor describes Superman's enhanced Kryptonian physiology as being vulnerable to kryptonite's particular radioactive "signature". More recently, some issues of Superman indicate the mechanism by which green kryptonite may hurt Superman. Superman's cells absorb electromagnetic radiation from stars (like Earth's sun). Kryptonite's radioactivity interferes with this semi-photosynthetic process, driving the energy out of his cells in a painful fashion.
Long-term exposure to kryptonite is said to have the same effects on human beings as exposure to other radioactive materials; an extended storyline in the comics around 1990 involved Lex Luthor developing cancer from the kryptonite ring he kept on his finger.
|Colors of Kryptonite||Effects|
|Green Kryptonite|| The most common form of kryptonite, created by the "radioactive chain reaction" which destroyed Krypton, and "scattered throughout space as meteors." In superpowered Kryptonians, causes immediate physical pain and debilitation, reduces their powers, and kills within hours. Green kryptonite is a radioactive substance and as such, prolonged exposure to green kryptonite can cause cancer in humans. Green kryptonite has been shown to strengthen Bizarro. Lead as well as normal containment methods for radioactive substances has been shown to block kryptonite radiation. In the Superman movie continuity and the television series Lois & Clark: The New Adventures of Superman, green kryptonite is shown as effectively removing Superman's powers during the time he is exposed. In Lois & Clark he remains as vulnerable to injury as a human for a few minutes afterward. In most comics continuity, however, Superman retains his powers to some degree while exposed to green kryptonite, although dramatically weakened and in severe pain. His skin also begins to turn green. In various stories, Superman is shown to have become immune to the effects of green kryptonite either to repeated non-fatal exposure, continuous long-term absorption of solar radiation or extremely high short-term exposure to the Sun.|
Green kryptonite is typically shown to have no short-term effects on humans or non-superpowered Kryptonians. However, in post-Crisis continuity, long-term exposure can cause radiation poisoning in humans.
In Smallville, green kryptonite can cause normal humans to mutate and acquire superhuman abilities, although an outside catalyst (such as a strong electrical charge) is usually required. In the episode "Void", kryptonite injections cause near-death experiences in humans. After Clark is injected with kryptonite and apparently dies, Chloe reports "actually dying neutralizes the kryptonite in your system".
Green kryptonite, being radioactive, has been used as an energy source to power reactors in power stations. The supervillain Metallo uses green kryptonite to power his cyborg body.
|Red Kryptonite|| No two chunks of red kryptonite have the same, "unexpected," effect on Kryptonians. In one episode of Superfriends, 3 Kryptonian criminals exposed at the same time were all affected differently. Effects are typically depicted to last for 1-2 Days, after which the Kryptonian in question is always immune to that specific chunk of red kryptonite. However, in some incarnations the effects of red kryptonite last only as long as the Kryptonian is exposed to it. Pre-Crisis red kryptonite was created from a "flock" of green kryptonite which passed through a (red-hued) "strange cosmic cloud," some of which arrived on Earth. In post-Crisis continuity, red kryptonite first appears as an artificial construct of Mr. Mxyzptlk, then as a synthetic variant created by Ra's al Ghul, using notes stolen from Batman.|
Superman has suffered the following random effects upon exposure to various pieces of red kryptonite: being turned into a dragon, a non-powered giant, a dwarf, an ant-headed humanoid, a lunatic, and an amnesiac; being made unable to see anything colored green; growing incredibly long hair, nails, and beard; being rendered totally powerless; growing fat; gaining the ability to read thoughts; growing a third eye in the back of his head; losing his invulnerability along the left side of his body; being split into an evil Superman and a good Clark Kent; being split into young and old forms (Superboy and Superman); being rendered unable to speak or write anything but Kryptonese; growing an extra set of arms; becoming clumsy; swapping bodies with the person nearest him upon exposure to it; transferring his powers; rapidly aging; multiple personality changes; and having his skin rendered transparent, overloading him with solar power.
In Lois and Clark: The New Adventures of Superman, red Kryptonite initially caused Superman to become apathetic. He simply did not care about catching criminals; instead shrugging his shoulders, blaming others and talking to a girl. It was hypothesized that, given enough exposure to red Kryptonite, Clark's condition would become permanent. However, after talking to a psychiatrist, Clark was able to resist the effects of the red Kryptonite, and he picked up the rock and threw it out of a window. Its later appearances included a red Kryptonite laser which caused Superman's powers to transfer to Lois, and exposure causing Superman's powers to be increased beyond his ability to control them.
On the TV series Smallville, red kryptonite has a drug-like effect, causing severe changes in Clark Kent's personality. Under this influence, Clark loses his inhibitions, becoming unpredictable and acting purely on erotic and selfish emotions. Smallville red kryptonite requires close contact with skin to be effective.
In Krypto the Superdog, effects on Krypto include temporary amnesia, losing all super powers, causing Krypto's tail to detach from his body and come to life, and body-swapping.
|Gold Kryptonite|| Permanently removes superpowers from Kryptonians, by destroying the ability of Kryptonian cells to process solar energy. For obvious reasons, this variety is little-used in Superman stories. Gold Kryptonite appears in The Flash (vol. 1) #175 and plays a key role in the 1982 limited series "The Phantom Zone", as well as the 1986 "imaginary story" Superman: Whatever Happened to the Man of Tomorrow?, a possible conclusion to the story of Superman of Earth-One.|
Post-Crisis, gold kryptonite has appeared in Adventures of Superman #444 and Superman (vol. 2) #22. In the Legion of Super-Heroes (vol. 2) #293, during the Great Darkness Saga, it is shown that Element Lad can transmute matter into gold kryptonite.
In one instance, gold kryptonite is shown to instead cause cellular degeneration and accelerated aging; however, it is not confirmed if this is true of all gold kryptonite because this version was presumably created by the time traveller Gog.
In Action Comics Annual #11, Metallo mentions that the Gold Kryptonite in his chest only temporarily removes a Kryptonian's powers.
|Blue Kryptonite|| Blue kryptonite is the Bizarro analogue to green kryptonite. Using Bizarro logic, this, in general, hurts Bizarros while having beneficial effects on ordinary Kryptonians. Pre-Crisis, blue kryptonite is the result of using Professor Potter's "duplicator ray" on some green kryptonite. Here, blue kryptonite affects Bizarros like green kryptonite affects Kryptonians. Blue Kryptonite radiation is not blocked by normal lead but by imperfectly duplicated lead. Bizarro World, a sentient planet, had animated Blue Kryptonite golems underground that surfaced and attacked the Super-Powered Bizarros while the delighted non-powered bizarros cheered them on. Exposure to Blue Kryptonite radiation turned the mind of the original Jimmy Olsen when his mind was turned to that of a Bizarro, back to his normal state of mind. In an episode of Super Friends, blue kryptonite heals Superman from the effects of red kryptonite. Post-Crisis, its origin is unknown. Here, blue kryptonite makes Bizarros become polite, goodhearted, coherent, and intelligent. It also causes physical pain much like green kryptonite affects Superman.|
In Smallville, blue kryptonite suppresses Kryptonians powers and removes their sensitivity to green kryptonite. Blue Kryptonite is therefore not a reverse analogue of Green Kryptonite. Blue Kryptonite was first introduced as a Victory Ring given to Clark by a replicant of Lara El in "Blue". Also in Smallville, the Phantom Bizarro's powers were increased exponentially by blue kryptonite, overloading his powers and killing him, much like "a light bulb being powered by a nuclear reactor", in the episode "Persona". This is due to the reverse effect of kryptonite on Bizarro - where it causes Clark to lose his powers, it gives Bizarro new and immense power.
Blue kryptonite has also been used in Superman video games as a life restorative due to its bizarro nature.
|Black Kryptonite||Black Kryptonite was first introduced in the Smallville television series, in the fourth season premiere episode "Crusade", as Kryptonite with the ability to split the personality of Kryptonians. It later appears in the fourth season episode "Onyx", where it is revealed to split physically the bodies of humans. In the series, Black Kryptonite can be created by super-heating Green Kryptonite. It later made its first appearance in a DC comic in September 2005's Supergirl #2, where it apparently possessed the ability to split a person or a person's personality into two separate entities. In Supergirl #3, Luthor used Black Kryptonite on Supergirl, which caused her to split into two separate people, one wearing Supergirl's traditional costume, and another wearing a black-and-white version. Her black-and-white costume is similar to the one that Superman was wearing when he returned from the dead. Luthor noted that he was given the Black Kryptonite by the self-proclaimed god Darkseid, who may have been responsible for its creation (a synthesized version of Kryptonite in the feature film Superman III had similar effects on Superman, creating an evil Superman). In All-Star Superman, which takes place outside of DC Universe continuity, Black Kryptonite makes Superman evil, almost as if he is transforming into Bizarro Superman.|
|White Kryptonite||Kills all plant life, whether Kryptonian or not. Induces decay immediately upon exposure, with a range of about 25 yards. The most prominent use of this variety in the comics was to destroy Virus X, which was revealed in a storyline in 1968's Action Comics #362-366 to actually be a form of plant life.|
|Jewel Kryptonite||Jewel Kryptonite amplifies the psychic powers of Phantom Zone residents, allowing them to project illusions into the "real world" or perform mind control. It was made from what was left of a mountain range on Krypton called the Jewel Mountains. In the post-Crisis Silver Age limited series, a "prismatic gem from the Jewel Mountains of Krypton" was used by the Injustice League to amplify the psychic powers of the Absorbascon, but was not referred to as Jewel Kryptonite.|
|Anti-Kryptonite||Has no effect on superpowered Kryptonians, but has the same effects as Green Kryptonite on non-superpowered Kryptonians. This version of Kryptonite is what killed most of the residents of Argo City in the pre-Crisis comics. Anti-Kryptonite was likely introduced to cover a writer error, as in the original Argo City story, the residents of Argo City are killed by Green Kryptonite even though it should have had no effect on non-superpowered Kryptonians. Post-Crisis, it is the power source of Ultraman, Superman's evil counterpart who lives in an alternate antimatter universe. Anti-Kryptonite was also used by Green Lantern Hal Jordan while rescuing a member of the Green Lantern Corps (Guy Gardner) from the Phantom Zone to cause pain to General Zod, Kru-El, and Faora (since regular Kryptonite has no effect on individuals in the Phantom Zone). This was shown in the Green Lantern comic book series of the 1980s.|
|X-Kryptonite||Created accidentally (and unknowlingly) by pre-Crisis Supergirl during experimentation with Green Kryptonite, in an attempt to find an antidote. The "unique combination of chemicals" used by Supergirl created "something new under the sun," whose radiation (and odor) can imbue Earth-based lifeforms with temporary superpowers. It has no additional effect on Kryptonians (although the latent kryptonite radiation is still harmful to them), and is primarily known as the source Supergirl's pet cat, Streaky's superpowers. Not to be confused with Kryptonite-X.|
|Slow Kryptonite||A modified variety of Green Kryptonite produced by supervillain Metallo that affects humans in a manner similar to normal Green Kryptonite on Kryptonians, appearing in The Brave and the Bold #175. Its effect on Kryptonians, if any, is undocumented.|
|Magno-Kryptonite||Artificially created by the villain Nero, "Magno-Kryptonite" is magnetically attracted to all substances originally from Krypton, with such incredible force that not even the strength of Superman or Bizarro can escape it according to Superman's Pal, Jimmy Olsen #92. It is not specifically stated if any parts of its alloy are of Kryptonian origin.|
|Bizarro Red Kryptonite||Affects humans the same way Red Kryptonite affects Kryptonians. Appeared in Superman's Pal, Jimmy Olsen #80.|
|Kryptonite-X or Kryptisium||A form of filtered/purified Kryptonite. Professor Emil Hamilton used the term "Kryptonite-X" (The Adventures of Superman #511, April 1994, page 13) to describe the substance that restored Superman's powers after a confrontation with the villain known as the Cyborg Superman in Engine City (Superman v2, #82, part of the "Return of Superman" storyline). This substance was created when the Cyborg used a huge chunk of Kryptonite in an attempt to kill the weak, powerless, recovering Superman. The Eradicator, who had fashioned a faux-Kryptonian body using a Kryptonian matrix, jumped in front of Superman before the release of the Kryptonite energy could kill him. Despite the Eradicator's efforts, the Kryptonite energy hit Superman, but instead of killing him, it transferred all of the characteristic Kryptonian powers from the Eradicator to Superman, as well as saturating Superman's body with a purified/filtered form of Kryptonite. This substance eventually led to Superman becoming an over-muscled giant, due to his accelerated sunlight absorption and overstorage of energy. (This Kryptonite is not to be confused with X-Kryptonite.)|
|Silver Kryptonite||In the television show Smallville episode titled "Splinter," manufactured "silver kryptonite" brings out Clark's paranoid side, and his delusions show him some of his greatest fears, which he believes to be real. The effects of the kryptonite were removed by Dr. Fine (Brainiac) who sent the "silver meteor rock" to Lana in Lex's name to "help" her with her astronomy paper. Clark pricked his finger with the sharp edge of the rock as he held it while visiting Lana in her dorm room, causing him to feel the effects immediately. However, this "new form of kryptonite" turned out to be a hoax (see Smallville entry below).|
|Magic Kryptonite||In Superman/Batman #46, an enchanted piece of Kryptonite has effects similar to Marijuana, until Batman finds another piece which cancels out the effects of the first piece. The first piece is a silver crescent. The second piece is a lavender round rock that fits into the crescent.|
|Pink Kryptonite||From Supergirl (vol. 2) #79, an alternate timeline in a 2003 Supergirl storyline by Peter David, this bizarre variety of Kryptonite apparently turned heterosexual Kryptonians temporarily and stereotypically gay; it was seen in just one panel, with Superman giving flattering compliments to Jimmy Olsen about his wardrobe and decorative sense. It spoofs the more "innocent times" of the Silver Age (Lois Lane is depicted in this story as not understanding what's gotten into Superman).|
Kryptonite was used in a rap song called Kryptonite by rapper Big Boi, but in the song kryptonite means marijuana because they are both green.
Kryptonite also appears in the 2000 3 Doors Down hit by the same title as well as the Five For Fighting 2000 song "Superman." Both songs deal with the often over-looked difficulties in being a superhero, depicting a trend in the superhero genre where these classic heroes--once seen as untouchable and, indeed, superhuman--are portrayed as flawed and troubled.
Professional wrestler Mike Bucci, who performed under a superhero gimmick called Super Nova, named his finishing move the "Kryptonite Krunch".
Depictions of kryptonite in the various films and TV series of Superman have largely been limited to green kryptonite, with occasional appearances of the red and blue varieties.
An imperfect synthesis of artificial kryptonite containing tar appeared in Superman III. Ross Webster (Robert Vaughn) orders the creation of synthetic kryptonite after remembering a Daily Planet story about the last original chunk disappearing years earlier after falling to Earth (whether Webster references the kryptonite robbery in Superman: The Movie is unclear.) Developed by Gus Gorman (played by Richard Pryor), it was intended to be a copy of Green Kryptonite. After scanning the coordinates of Krypton's former location via satellite, results return a small percentage of an unknown component. The substitution of tar (which Gorman used after glancing at a cigarette carton) for a crucial, but unknown, component resulted in the synthetic kryptonite behaving like a combination of Red Kryptonite and Black Kryptonite; in this case, the kryptonite turned Superman evil and eventually split him into two people. The evil Superman and Clark Kent, the embodiment of Superman's remaining good qualities, then engage in an epic battle at a deserted junkyard, where Clark emerges victorious and the evil Superman fades from sight (it should be noted that this might only have been an hallucination on Superman's part). Later in the film, Gorman's creation, the Ultimate Computer, severely weakens Superman with a kryptonite ray before Gorman has a change of heart and attacks his own machine.
In Superman Returns, an additional piece of kryptonite is found in a rock fragment, once more in Addis Ababa. Lex Luthor steals it from a Metropolis museum and uses it in his quest to create a new kryptonite landmass, much like how young Clark created the Fortress of Solitude. In addition, he uses a shard leftover from processing it to create a kryptonite shiv, which he uses to stab Superman with at one point. Interestingly, Kryptonite is never once referred to as the term "meteor" as it is in the previous movies and Smallville series, only as "distant remains" or "radioactive pieces of [Superman's] home-world". This may have been an attempt on the writers' part to distinguish the Kryptonite of the movie away from Smallville, which is almost always referred to as "meteors".
Green Kryptonite made several more appearances throughout the series, used mostly by Lex Luthor (played by Sherman Howard) and Metallo (played by Michael Callan). In the third season episode "Bride of Bizarro", Luthor sent Bizarro to a military research base to steal a large amount of Kryptonite, which Luthor was seen using on Superboy in later episodes. In the fourth season episode "Kryptonite Kid", a young man named Mike Walker (played by Jay Underwood) working at the same military research base was caught in a Kryptonite explosion while working to find a cure which would make Superboy immune to the radiation. The Kryptonite entered his bloodstream and turned his skin green and he became "living, breathing Kryptonite" able to fire Kryptonite radiation from his hands. In "Obituary for a Super-Hero", Luthor used a Kryptonite bomb planted on a yacht to attempt to kill Superboy.
Red Kryptonite made an appearance in the second season episode "Super Menace". This version of Red K was created at a military research base where scientists were working to neutralize Kryptonite's effect on Superboy while still retaining its radioactive properties so it could be used as a power source. Their experiments turned the Kryptonite red, making it useless as a power source and altering its effect on Superboy. This Red Kryptonite turned Superboy evil, much like Red K would later do in the "Smallville" TV Series, except only a single exposure to it was required, rather than constant exposure. After Superboy wreaked havoc with Metallo, Lana Lang (played by Stacy Haiduk) tricked Superboy into being exposed to another chunk of Red Kryptonite which reversed the effects of the first. This is Red Kryptonite's only appearance in the series, so it is unknown if the substance would have had other effects on Superboy if it had appeared again.
The "Superboy" series also introduced a form of White Kryptonite, however this was not the white kryptonite that kills plant life (as seen in the Pre-Crisis comic books). This White K was created by Professor Peterson's duplicating ray in an attempt to create a form of Kryptonite that would kill the molecularly unstable Bizarro. This Kryptonite did not kill Bizarro, however. It instead had an opposite effect on him and actually stabilized and cured him, preventing him from eventually exploding as previous Bizarro duplicates had. White Kryptonite made only one appearance in the series in the episode "The Battle With Bizarro". It is referred to again in "The Bride of Bizarro" but it is not seen.
The harm inflicted on Clark by kryptonite on Smallville is varied. He cannot be near green kryptonite without doubling over in nausea and pain, and if he were to hold a fragment of it in his hand, it would burn to the touch and the veins in his hand would become exposed and green. However, on other separate occasions Clark has held and even ingested kryptonite (albeit in dilluted form) and been merely weakened. When a vial of Clark's blood was held up to kryptonite to verify its authenticity, the blood began to boil.
Red kryptonite has also been shown in Smallville. Its effect on Clark Kent is to rid him of all inhibitions, making him rebellious and potentially dangerous if exposed to it for too long. Also created for the series was black kryptonite (first appearing in the episode "Crusade"), which is capable of separating certain entities within individual organisms, e.g., splitting a person's good and evil sides.
Black kryptonite was formed by heating up green kryptonite. In the series, after Clark's "reprogramming" by Jor-El in the caves, Martha Kent used black kryptonite to reveal the two psyches of Clark, the militant Kal-El (not to be confused with the rebellious "Kal" alias caused by red kryptonite), and normal Clark. In a later episode, Lex Luthor was experimenting with a process to heat up green kryptonite and irradiate seeds, in order to separate the "weak" genes from the "strong" genes in the seeds. The result was hardy but rotten-tasting fruit, implying a yin and yang balance within fruit, as well as within humans. An accident with this process caused Lex to split into a good Lex and a bad Lex who referred to himself as "Alexander".
Silver kryptonite made an appearance in the fifth season episode entitled "Splinter'. Like the previous comics incarnation, this silver form was not a true form of the stone. In the episode, Clark pricked his finger on a rock that was black and had silver-metallic clusters, and subsequently became increasingly paranoid, hallucinating that others were conspiring against him. In the episode's final scenes, it was revealed that a splinter of the element entered Clark's bloodstream. It was also shown that silver kryptonite was created artificially from the liquid metal which forms Brainiac's body.
In the eighth episode of Smallville's 7th Season, entitled "Blue," there was a new form of Kryptonite. It was blue kryptonite, and it stripped Clark of his powers. This happened when Lara-El, Clark's mother, gave Clark his father's blue ring to wear, without knowing the effect it would have on him. The ring was impossible to remove until Clark returned to The Fortress of Solitude. As in the comics, blue kryptonite is fatal to Bizarro. It increases Bizarro's power exponentially so that his body is not able to contain it, causing him to explode.
Kryptonite, in the animated series, still has effects on normal humans as well. Two moments are evidence of this. First, the "Jade Dragon" from The Batman/Superman Movie (a crossover between The New Batman Adventures and Superman: The Animated Series) is a statue of kryptonite carved in the form of a Chinese dragon, said to be cursed because all of its owners all died within a few years of acquiring the piece. Second is Lex Luthor's kryptonite poisoning/cancer as seen in Justice League, attributed to Lex's admitted habit of keeping a fist-sized chunk of kryptonite in his pocket for years. This does bring up the question of Batman's habit of also carrying a piece of kryptonite in his own belt; however, since Batman has seen what the kryptonite did to Luthor, the famed methodicality of Batman may mean that he likely has the pouch lined with lead. In Batman Beyond, it was revealed in the two part episode "The Call" that Bruce Wayne kept the kryptonite for the rest of his life, and kept the needle of kryptonite locked up very securely in the Bat Cave. The Justice League series also reveals how Batman obtained the kryptonite.
Green kryptonite remains the only variety of the substance ever seen in the DC Animated Universe.Krypto the Superdog episode "Streaky's Cat Tail" features "purple-spotted kryptonite", which causes Superdog to compulsively chase his tail. However, this was almost certainly a product of Streaky's imagination. Red Kryptonite has appeared and is stated as having weird effects on Kryptonians for a day; it has swapped the minds of Kevin and Krypto, removed Krypto's powers, and in another episode caused Krypto's tail to become sentient and separated from his body.
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