Information about all of them can be found below.
Scorpius frequently attempted to gather powerful objects to himself, including the Quasar Sabers and the Lights of Orion. The result of these mad quests often left the objects in question in the hands of the Galaxy Power Rangers, and severely depleted Scorpius' army as they were either punished or destroyed by the Rangers.
Scorpius had a daughter, Trakeena, upon whom he doted. He refused to allow her to be involved in his evil deeds, and he would not allow her to engage the Rangers in battle despite her requests.
Eventually, Scorpius webbed a cocoon for Trakeena. He told her that it was her time to enter the cocoon, to shed her mortal beauty and become an insect with magnificent powers, like him. Trakeena declined, and when Scorpius tried to force her, she ran away and teleported out into space.
Scorpius had later met Deviot and appointed him as his new general. Deviot plotted against Scorpius, to depose him and enter the cocoon so that he could gain great powers. Deviot tricked Scorpius into attacking the Galaxy Power Rangers, saying that Trakeena was their prisoner. Though Scorpius was mortally wounded, Trakeena returned to take his throne before Scorpius could pass it to Deviot. Before he died, Scorpius told Deviot to be as loyal to Trakeena as he had been to him.
Scorpius is voiced by Kim Strauss.
NOTE: When Scorpius was invading the Magna Defender's home planet 3,000 years ago, among the monsters he brought with him are/were Radster, Sledger, Fishface, Impostra, and Motor Mantis.
Trakeena is the main antagonist in Power Rangers Lost Galaxy, the insectile daughter of Scorpius, the evil princess of his alien army. Trakeena was born with both mortal beauty (human beauty) and insect features as well. She carries a staff with a cockroach emblem on the side of it, but lost this one in the desert on Onyx. However, after her father's death, she gained another staff with an amber-encased spider within the staff that could also be transformed into a sword to be used for hand-to-hand combat. She can use her insect armor to protect her from harm, but was never shown to have used it in any of the episodes after her father's death.
Trakeena was incredibly vain and proud. On one occasion, she had the monster Crumummy steal the beauty from all the female inhabitants of Terra Venture, because she hated the thought that they might be more beautiful than her. This plan was foiled, however, and the beauty was restored to the inhabitants of the station.
She also liked to accompany her father's generals on their missions, though her father disapproved of it. In one such case, Treacheron claimed that Trakeena had followed him to battle, whereas in truth, he had allowed it. This upset Trakeena, and in retaliation she convinced her father Scorpius that Treacheron was a traitor, for which he was locked up. This feud continued, and Treacheron tricked Trakeena into searching for a silver goblet, just so that he could ambush her once he was free from his cell. She was saved only thanks to the intervention of the Galaxy Power Rangers.
Eventually, Trakeena learned that her father Scorpius wished for her to enter the cocoon, to become an insect with great powers, like him. She refused, mainly not wanting to lose her mortal beauty the transformation would cause, and fled to the planet Onyx when he tried to force her, where she met Villamax. Villamax offered to train her to be a great warrior, and taught her swordplay and martial arts. She returned to the Scorpion Stinger after hearing of Scorpius' defeat at the hands of the Rangers. While Scorpius was dying, Trakeena was given his throne and all of his powers. Deviot told her that Scorpius was destroyed by the Red Galaxy Ranger. Though she captured the Red Galaxy Ranger, he escaped.
Though Trakeena had put her father's cocoon into storage, Deviot still wanted to enter it to gain power. He dragged her into the cocoon, where they merged into a single being. Deviot's power and ruthlessness had been incorporated into her personality, driving her insane. She launched a full-scale assault on Terra Venture, loading her Sting Wingers with bombs, so as to destroy the colony. Her general Villamax believed that this tactic of mass suicide bombing was foolish as Trakeena was destroying her own army. Using this tactic, Trakeena succeeded in bringing Terra Venture down, and destroyed the Stratoforce and Centaurus Megazords, though in the process lost her whole army. She later destroyed Villamax when he disobeyed her orders, trying to prevent her from attacking civilians, and entered the cocoon again when the Scorpion Stinger crashed after the Power Rangers self-destructed the Astro-Megaship in an attempt to stop it. She emerged, mutated into a green, humanoid insect, just as her father had intended. She powered up Terra Venture's remains to destroy the colony on Mirinoi. Her full plan was to crash the damaged Terra Venture into Mirinoi, obliterating the colony stationed there and destroying both herself and the Power Rangers in the crash. She engaged the Rangers in battle, and was seemingly destroyed by the Red Galaxy Ranger's Battlizer. The crash of Terra Venture was diverted from the colony by the timely intervention of the Galaxy Megazord, under control of the Galactabeasts only, in this instance.
However, in Power Rangers: Lightspeed Rescue, it was revealed that she had survived and managed to return to her human form, though was now horribly disfigured. She then made her way to Earth, planning to obtain her revenge on the Rangers by destroying their homeworld. She acquired the allegiance of the Demon Triskull and his army of ghouls, collecting energy to return to her insectoid form. To do that, she captured humans to drain their lifeforce. However, Olympius, tainted the energy with a poison dagger, causing Trakeena to mutate into a gigantic monster. Despite the help of the Galactabeasts, the Galaxy and Lightspeed Rangers were unable to stop her until the Omega Megazord became infused with the Lights of Orion. Trakeena was then permanently destroyed.
Trakeena was the first human-looking villain to be killed (but only after mutating into an inhuman monster). Most previous human-looking villains (Rita, Divatox, Astronema) were turned good instead.
When Furio learned that the powerful Lights of Orion were hidden in the Forest Dome of Terra Venture, he used Mutantrum to disguise himself as Mike to trick Leo into getting into the cavern.
When Scorpius tired of his failures, Furio fled and encountered Leo. Deciding that he would take the Red Galaxy Ranger down if he was going down, Furio charged himself up to self-destruct. Furio was destroyed, but Leo survived the blast, having been saved by Magna Defender.
Furio is voiced by Tom Wyner.
NOTE: While Lost Galaxy is based on Gingaman, Furio's costume is from Denji Sentai Megaranger. Furio's sentai counterpart is actually the final form of Megaranger's main villain, Doctor Hinelar. However, some parts were repainted. Furio's role in the story mirrors Gingaman villain Sanbash (whose costume was used for a very different character, Villamax). It is believed that the Sanbash costume was not available to be used, so the Hinelar costume was used for Furio and the Sanbash one used for a different character once it was obtained.
After Furio's destruction, Treacheron was appointed the general position. At Scorpius' request, he was sent to find the Lights of Orion.
On one occasion, Treacheron was seduced by Trakeena into taking her to Terra Venture to find the Lights and battle the Rangers. He complied, despite knowing that Scorpius would be angry about it. When he was forced to explain himself, he lied that Trakeena had followed him without his permission.
When the Lights had finally been found, Scorpius sent Treacheron and Destruxo to retrieve them. Impostra, disguised as Treacheron, tricked Destruxo into absorbing the power of the Lights, and Scorpius, believing that Treacheron had betrayed him, confined Treacheron to a cell. Treacheron swore to make whoever had done this to him pay dearly.
The Shark Brothers informed him that it was Trakeena that had set him up. Treacheron arranged some payback. He told Trakeena about the location of the Silver Goblet, then escaped and set up an ambush for her. Treacheron would have slain her, but the Rangers interrupted. Treacheron was destroyed by Leo Corbett in his Orion Armor.
Treacheron is voiced by Derek Stephen Prince.
After escaping the Lost Galaxy, Deviot was attacked by Trakeena, and both fell into the cocoon. The being that emerged was an amalgam of Deviot's evil and Trakeena's power.
Deviot is voiced by Bob Papenbrook.
Villamax's honorable qualities, like that of the unbrainwashed Ecliptor of Power Rangers: In Space, often clash with the ruthless evil of Deviot (one notable instance is when he actually let the other rangers and the Magna Defender go after Leo agreed to give himself up to Trakeena, which he promised to do beforehand). Villamax is particularly horrified when Trakeena and Deviot merge, and Trakeena becomes a merciless maniac. When Villamax saves a young girl during Trakeena's assault on Terra Venture, and she gives him a flower, Villamax wants nothing more than for Trakeena to stop her chaos. When Villamax attempts to reason with Trakeena, she kills him and crushes the flower. Villamax's final words to Trakeena were, "You've learned nothing."
Villamax is voiced by David Lodge.
Kegler became suspicious of Deviot when he disrespected Villamax's code of honor. It is possible that it was Kegler that learned of Deviot's treachery and informed Villamax and Trakeena while Deviot was in the Lost Galaxy.
After Trakeena and Deviot merged into one being, Kegler witnessed the death of Villamax at Trakeena's hands. He was not destroyed on screen, but he presumably died in the Scorpion Stinger when it crashed on Mirinoi's moon.
Kegler is voiced by Richard Cansino.
NOTE: In Gingaman, Kegler is Hexuba and Rykon's uncle.
When Deviot joined Captain Mutiny's crew, Mutiny was a bit reluctant, fearing that if Trakeena found out, she would "toss him overboard". This goes to show that not only does Mutiny know of Trakeena, but is afraid of her as well.
When he pursued them into the normal galaxy, Trakeena destroyed his castle, taking him down with it.
Captain Mutiny is voiced by Mike Reynolds.
NOTE: In the flashback scene from "The Sunflower Search", Captain Mutiny appears in a brief shot of Scorpius' army invading the Magna Defender's home planet 3,000 years ago.
Barbarax is voiced by Richard Epcar.
Hexuba is voiced by Rajia Baroudi.
NOTE: In Gingaman, she is Kegler's niece and Rykon's sister.