Mumm-Ra
The archenemy of the ThunderCats, Mumm-Ra is the self-proclaimed "ever-living source of evil" on Third Earth, having powers of sorcery and an apparently unlimited lifespan. He is, in fact, a bound servant to the Ancient Spirits of Evil (represented by four statues within the burial chamber of his pyramid), who provide him with increased power and virtual immortality to further his pursuit of spreading their dark influence throughout Third Earth.
Residing within the Black Pyramid amid the ruins of what appears to be an ancient Egyptian civilization, Mumm-Ra exists in a decayed, weakened form that must return to a stone sarcophagus to replenish his energy. When leaving the pyramid, he can summon the power to transform himself into a more vigorous form: Mumm-Ra, the Ever-Living by reciting the following incantation:
- “Ancient spirits of evil, transform this decayed form to Mumm-Ra, the Ever-Living!”
While in this form, Mumm-Ra possesses superhuman strength, the ability to fly, as well as fortification of his mystical might — casting spells, throwing energy bolts, etc. — to battle his foes. He can also alter his physical form into a variety of alter-egos to deceive his enemies.
Seemingly invincible in whatever form he chooses, Mumm-Ra appears to have a singular weakness: seeing his own hideous reflection neutralizes his ability to remain outside the Black Pyramid and forces him to withdraw there in his emaciated mummy form. However, as the series progressed, the Ancient Spirits of Evil eventually overcame this shortcoming to make Mumm-Ra even more formidable.
Above all, Mumm-Ra is a master of deception, and will use whatever means necessary to fight against the forces of good.
Mutants
These creatures are the first villains seen in the series, originating from the planet Plun-Darr. They are the long-time enemies of the Thunderians. Later in the series, it is revealed that events stemming from their invasion of Thundera ultimately lead to the destruction of that planet.
Not content to see the Thunderians lose their homeworld, the Mutants chased after the survivors, using their spaceships to decimate the Thunderian fleet and seeming to destroy the majority of the doomed planet's escaping populace. They then boarded the flagship — which carried the ThunderCat nobles, Jaga the Wise and the young Lion-O — in attempting to capture the Eye of Thundera. They were repelled and retreated to later relocate the crashed flagship on Third Earth.
It was here that Mumm-Ra’s power grounded the Mutant ship, and they were forced to follow his demands once he sank their vessel beneath the desert sands. Though they exhibit an extraordinary incompetence (characteristic of most cartoon villains), the Mutants manage to construct their own fortress called Castle Plun-Darr (named after their homeworld) and salvage equipment from their downed spaceship to build weapons and vehicles that they use on Third Earth (e.g., the Skycutters, the Nosediver, etc.).
The Mutant group is comprised of a diverse mix of races, including:
- Reptilians — Bipedal lizard-men. Their brutish leader, Slithe, is the best example of these creatures. Domineering and impatient, Slithe often must browbeat the other Mutants into going along with his plans. He pilots the Nosediver.
- Simians — Ape men whose leader is Monkian, a shifty no-good who makes a habit of eavesdropping. He often plays the role of scout for the Mutants, and is frequently the first to run from danger. He pilots one of the Skycutters.
- Jackalmen — Canine scavengers. Their leader is Jackalman, a distrustful coward who leaps at taking any advantage he can get — so long as no risk is involved. He most often sides with Slithe, if only to keep from being the scapegoat when plans fail. He also pilots a Skycutter.
Other Mutants are:
- Vultureman — This crafty, avian opportunist is the chief inventor and mechanical know-it-all for the Mutants. His skills with both machines and science make him often indispensable, but he’s more often than not blamed when his devices or machines fail to live up to Slithe’s expectations. Much later, he decides to work for his own gains, and often strikes solo deals with Mumm-Ra. He pilots a vulture-styled Flying Machine, and later commands weapons like the Mutank and Thundrainium Cannon. Unlike the other mutants, Vultureman was not introduced in the opening episode of the series.
- Ratar-O — A General in the Mutant armies, this portly rodent is considered the most cunning and evil of all the Mutants. He comes to Third Earth at the behest of Vultureman to aid them in defeating the ThunderCats. His flagship, the Ratstar, is a powerful war machine, and though it crashes, Ratar-O salvages parts to make a Mutank to continue the fight. He is strong, and wields the Rat’s Eye — a pair of criss-style daggers which have two mystical gems embedded in their hilts — that he can use to fire energy blasts, levitate foes and even fly through the air. Ratar-O resembles Ratilla the Terrible, the former holder of the Sword of Plundarr, but it is unknown if they share a family relation.
Lunataks
Hailing from the Moons of Plun-Darr, these vile beings were once feared criminals in ancient times. They dwell in Dark Side, a volcanic region on the far side of Fire-Rock Mountain. They were encased in molten rock by Mumm-Ra when they attempted to take control of Third Earth. Mumm-Ra later released them on the condition that they work for him to battle the ThunderCats. However, the Lunataks form their own 'third column' based in Dark Side, building a massive, floating fortress called Sky Tomb from which they strike against all of Third Earth. Their numbers consist of:
- Luna — A diminutive sorceress, now the leader and chief strategist of the Lunataks. Because of her small form, she is carried around and cared for by Amuk, her servant. Cruel and caustic, Luna at one time recovered the magical belt once worn by her grandmother, Queen Luna, and used its power to grow tall and mobile again, but reverted in size when the belt was later destroyed.
- Amuk — Luna’s loyal servant and bodyguard, also her chief mode of transportation. A hulking, dog-like brute having limited capacity for vocalization, Amuk is strong and fast but also displays enough cunning to exact revenge against Luna for abandoning him when she recovers Queen Luna’s magical belt.
- Tug Mug — A Lunatak from one of Plun-Darr’s moons with strong gravity, Tug Mug proves extremely powerful in the lesser gravity of Third Earth. He can use his tripod ‘legs’ to leap great distances, and his strength is so impressive that he once snapped the blade of the Sword of Omens with his bare hands (later repaired by the ThunderCat blacksmith, Bengali). Combative by nature, Tug Mug can use a "gravity carbine" in battle whose beams can make a person or object light as air or as heavy as stone.
- Chilla — This female Lunatak from the ice moon of Plun-Darr has command over cold and heat by the power of her expelled breath, blowing to freeze the air around a target in seconds to immobilize them, or heating it to incite flames to burn them. She has little regard for life and sometimes uses her powers willfully out of spite. Out of all the Lunataks, Chilla is the most humanoid and is the only attractive one of the group.
- Red-Eye — A Lunatak from the dark moon of Plun-Darr, this hulking brute has enhanced vision capabilities, allowing him to see things in infra-red and even to detect the ThunderCat Tygra when invisible. A loyal follower of Luna, Red-Eye uses a spinning discus (stored in his armored chestplate) to battle his foes. He is often the engineer and pilot of Sky Tomb.
- Alluro — A gangrel-creature with a slimey personality, Alluro is a master of mind-games and psychological warfare. He’s not much of a fighter, but he uses a powerful weapon called a Psyche-Club to immobilize his foes. The crystal ball launched from his club focuses his mental powers onto a foe, allowing him to manipulate their minds with illusions or to command them to do his bidding.
Hammerhand and the Berserkers
This odd band of pirates first appeared pillaging the northern shores of the Unicorn Forest (in the episode The Terror of Hammerhand). They have a habit of repeating certain words or phrases three times. They were thought to be killed when their ship sank — in fact, their leader’s spirit was later used by Mumm-Ra to animate a ‘clone’ of Panthro — but they reappeared in later episodes to capture the three Thunderian refugees. Initially only Hammerhand was identified by name; in subsequent appearances the characters were redesigned (to resemble their newly-released toy figures) and additional members with unique abilities were introduced. The Berserkers are:
- Hammerhand — The leader, who has a cybernetic arm that can punch and pound with great force.
- Topspinner — A warrior who can spin at high speeds to deflect missile objects or smash opponents. His spinning can also make him dizzy.
- Ram Bam — Rolling by the wheel embedded in his chest, this fighter can launch himself along the ground at high speeds to smash through objects like a battering ram. He also has rollers on his feet to help him move fast.
- Cruncher — A hulking pirate whose sheer strength can crush buildings and boulders with ease.
Other villains
- Grune the Destroyer — An anthropomorphized saber-toothed tiger in appearance, this former ThunderCat noble was once a good friend to Jaga the Wise on Thundera. His lust for power and greed turned him renegade against his fellow ThunderCats, forcing Jaga to fight him in a titanic battle that lasted for days. Grune was defeated by Jaga, then banished and sent into exile in space.
- Eventually his spacecraft landed on Third Earth and he began terrorizing its natives until, many years later, he was defeated (by unknown means) and sealed away inside a tomb (which was covered with a stone slab and a tree to prevent others from opening it). A tablet held the seal in place, until centuries later, a pair of Bolkens accidentally released his spirit. Once freed, the ghost of Grune seeks out the ThunderCats, attacking them to draw out Jaga, whose spirit ultimately defeats him using both Lion-O’s strength and the Eye of Thundera.
- However, Grune would return later when summoned by Mumm-Ra to stop Jaga’s spirit from obtaining the Star of Thundera (which was needed to help free three more Thunderians — Pumyra, Bengali and Lynx-O — from the Mutant prisons at Fire-Rock Mountain).
- Safari Joe — An intergalactic big-game hunter who ventures to Third Earth to hunt the ThunderCats. He uses a rifle that has a variable arsenal of weapons (capture claws, fire rounds, missiles, etc.), and has a robot assistant named Mule who helps to assemble traps, using a computerized analyzer to provide information on his prey. Safari Joe manages to capture all the ThunderCats and imprison them in cages made of thundranium, a substance that weakens ThunderCats. Safari Joe fails to capture Lion-O thanks to Snarf supplying a distraction. When Safari Joe finds himself out of ammunition, he is revealed to be nothing more than a coward. Safari Joe was made to promise that he would never hunt again, and Mule was reprogrammed to ensure he kept his word.
- Captain Cracker — A robotic space pirate who captains a starship named the Jolly Roger. He raids the Great Penal Planet to release a criminal contingent to help him take over the space-ways. He has a robot parrot named Polly.
- Captain Shiner — A space-faring alien mercenary commanding a starship named The Vertus and its sizeable crew. He is summoned on more than one occasion to carry out Mumm-Ra's bidding (for a substantial fee).
- Mongor — A goat-like being believed to be the personification of fear on Third Earth. For three centuries, Mumm-Ra had unsuccessfully tried to locate his tomb and free him, but the Thunderkittens accidentally freed Mongor, allowing him to attack and subdue the other ThunderCats. He feeds from his opponents' fears to grow larger and more powerful. His only weakness is for his foes to not look directly at him, which takes away his power (as Lion-O, Wilykit and Wilykat discover to defeat him).
- Driller — A metallic humanoid being who has a drill in place of legs. He also has changeable drill bits on his head, which allows him to drill through the sand, rock and dirt in the deep desert. His services are for hire; his chief price is diamonds, which he needs to keep his drill points sharp. He once captured Panthro for Mumm-Ra, and appeared again to drill a tunnel from Acid Lake to the Cat's Lair.
- The Shadowmaster — A Thunderian wizard who used a cloak of darkness to conjure his magical powers while attempting to take over the planet. He was defeated by both Jaga and Lion-O's father, Claudis, and was then banished to the 'Shadow Realm', but he managed to escape years later, kidnapping Claudis just before Thundera was destroyed. Through a sequence of nightmares, Lion-O eventually learns of his father's imprisonment in the Shadow Realm and is able to rescue him.



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