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ThunderCats follows the adventures of the eponymous team of heroes, cat-like humanoid aliens from the planet of Thundera. The series pilot begins with the dying Thundera meeting its end, forcing the ThunderCats (a sort of Thunderean nobility) to flee their homeworld. The fleet is attacked by the Thundereans's enemies, the Mutants of Plun-Darr, who destroy all the starships in the "ThunderFleet," but spare the flagship hoping to capture the legendary Sword of Omens they believe is onboard. The sword holds the mystical Eye of Thundera, the source of the ThunderCats's power, embedded in the hilt. Though the Mutants damage the flagship, the power of the Eye drives them back, and Lion-O's elderly guardian, Jaga, Voluteers to pilot the ship to the safety of the world of "Third Earth"; however, he dies in the process, because someone had to fly the ship, and because The journey to Third Earth takes several decades even with advanced interstellar spacecraft. The flagship contains the young Lord of the ThunderCats, Lion-O, as well as the ThunderCats Cheetara, Panthro, Tygra, WilyKit and WilyKat, and Snarf.

When the ThunderCats awake from their suspended animation on Third Earth, Lion-O discovers that his suspension capsule has failed to inhibit his aging, and he is now a child in the body of a man. Together, the ThunderCats and the friendly natives of Third Earth construct the "Cat's Lair," their new home and headquarters, but before long, the Mutants have tracked them down to Third Earth. The intrusion of these two alien races upon the world does not go unnoticed, however - the demonic, mummified sorcerer, Mumm-Ra, recruits the Mutants to aid him in his campaign to acquire the Eye of Thundera and destroy the ThunderCats so that his evil might continue to hold sway over Third Earth


Lion-O (character voice provided by Larry Kenney) — The leader, and the hereditary "Lord of the ThunderCats." Lion-O, based on the lion, wields the legendary Sword of Omens, able to fire bolts of energy and allow Lion-O to see across great distances with its power of "Sight Beyond Sight," and the Claw Shield, a gauntlet that launches grappling lines from its claws. Very handsome, as described by Cheetara. A mere child of twelve years old at the time of Thundera's destruction, Lion-O aged to adulthood during the trip to Third Earth when his suspension capsule failed to prevent him from aging too much, a malfunction that did not occur with WilyKat and WilyKit, who were around the same age as himself, though as Lion-O recalls in the series' first episode, his mentor Jaga had mentioned that some aging does take place while in the Suspension Capsules in which he and the other Thundercats were placed when their flagship was damaged. Lion-O assumed that this was the reason for his aging to adulthood, though he did not express any confusion regarding why WilyKat and wilyKit had not also aged as he had, which seems to indicate that he simply accepted it as a quirk of the capsules. Although cunning and skillful, he is truly a child in a man's body, and throughout the series, must learn what it takes to become a true leader and gain true maturity.

In the latter half of the show's first season, Lion-O has to put all that he has learned to use in the "Anointment Trials," which consist of contests of strength, speed, cunning and intelligence (this last is referred to as "mind-power" in the story arc) against each of the other ThunderCats (complicating matters for Lion-O is the fact that he is required to be unarmed for the contests; moreover, the other ThunderCats are not permitted to assist him. The Mutants attempt—ultimately without success—to take advantage of this last in an effort to leave the ThunderCats leaderless). Ultimately triumphing over Mumm-Ra in a final battle ("The Trial Of Evil") in the heart of the villain's pyramid in which he discovers that Mumm-Ra, like any Egyptian mummy, is dependent upon his sarcophagus, Lion-O is crowned the true Lord of the ThunderCats in an august ceremony attended by nearly every inhabitant of Third Earth. Lion-O also has the ability as Lord of the ThunderCats to command all cats, as he demonstrated in his battle with the Snowman of Hook Mountain when he commanded Snowmeow to halt.


Jaga (voice by Earl Hammond) — Known as “Jaga the Wise,” based on the jaguar, this elder warrior was once regarded as the greatest of all ThunderCats. An adviser and protector of the Lord’s family, it was Jaga who gathered the nobles of the ThunderCats to escort Lion-O and the Eye of Thundera to safety, but in his aged condition, he did not survive the trip to Third Earth. However, Jaga does reappear on Third Earth as a spirit — seen only by Lion-O at first, to guide him in his lessons and adventures. At times, he appears before the other ThunderCats as well, such as when facing down Grune the Destroyer, and when the ThunderCats need to rescue their fellow Thundereans. When he was alive, Jaga also wielded the Sword of Omens and was a formidable fighter in combat.


Tygra (voice by Peter Newman) — A staunch, level-headed warrior, based on the tiger, Tygra is known as the ThunderCat architect and scientist. He is the one Lion-O often turns to as second-in-command and for counsel. He is responsible for the design of all of the ThunderCat structures on Third Earth — the Cat’s Lair and the Tower of Omens. He is also gifted with "mind-power" — the ability to create life-like illusions in other people’s minds; he used this for Lion-O’s Anointment Trial, but it puts a great strain on him. He uses a whip-like bolas in combat, with which he can render himself invisible to the naked eye. In the episode "All That Glitters," Lion-O instructs Tygra, "If I do not return, you will be the new Lord of the ThunderCats." This verifies that indeed, Tygra is the second-in-command. Where creators Ted Wolf and Leonard Starr described Panthro's character as being based on "strength" and Cheetara's character as being based on "speed," Tygra's character was described as being based on "integrity."


Panthro (voice by Earle Hyman) — The next noble and also the second eldest after Jaga (until Lynx-O is introduced), based on the panther, this warrior is the chief mechanic/engineer and pilot for the ThunderCats. He is also physically the strongest and is a cunning warrior in combat, relying as much on martial arts as on physical strength. With Tygra’s help, he builds all of the vehicles the ThunderCats use on Third Earth — including the ThunderTank, the Feliner and the ThunderClaw, ThunderStrike and HoverCat. A jovial soul, he is, however, also quick to lose his temper and has a paralyzing fear of bats and a dislike of spiders. In combat, he uses a pair of chained fighting sticks (nunchaku) with open-away cat-paws, which house several chemical spray-compounds that he can use against foes. The spikes on his chest bands can be used like projectile weapons or as rappelling lines.


Cheetara (voice by Lynne Lipton) — A female warrior, based on the cheetah, who is the only adult female ThunderCat (until the later appearance of Pumyra). She is as lovely as she is brave and caring. Often a voice of reason, she is also the bearer of a budding "sixth sense," detecting when something is unsafe or if evil is near. This precognitive sense, which Cheetara regards as a curse for the most part, also allows her to perceive visions — whether involuntary or by forcing herself — but can leave her very weak; she may require days to regain her strength. She has incredible speed, once clocked at 120 m.p.h. on a morning jog. She can maintain this speed only for brief periods, but with it, she is very fast in combat. Her weapon of choice is a bo staff that can grow or shrink to variable lengths. When not in use, it is attached to her left armband. One episode found Cheetara mentally linked to an alien life form - a ship which had tapped into her 'sixth sense.' It was hinted that she had, at one point, developed romantic feelings towards Lion-O; yet the subject never came up after this episode, and the matter was dropped from the series altogether.


WilyKit and WilyKat (WilyKat's voice by Peter Newman and WilyKit's voice by Lynne Lipton) — Twin siblings (Kat, the boy, and Kit, the girl) who are the youngest members of the ThunderCat team, both based on the wildcat; they are technically and jointly referred to by the others as "ThunderKittens." They are the mischief-makers, and often have their own lessons to learn alongside Lion-O while they live on Third Earth, where they frequently use tricks and traps to combat evil. Kit is the more adventurous, while Kat usually errs on the side of caution. Kit also appears to be the more agile, and at times, she employs a rolling-attack against the enemy. Their agility is often displayed when they ride their "space boards" — specially designed flying devices shaped like Earth surfboards that can carry them over long distances. Each uses special capsules, balls and other gimmick weapons carried in pouches and on their belts. They sometimes use slingshots to fire these at the Mutants or other foes. They also carry trick lariats, with which they can either tangle and ensnare foes, or use to pull themselves out of danger. In the first episode, they appeared to be slightly older than Lion-O, but when they went into suspended animation, they did not age as far in their suspension capsules as Lion-O did in his. WilyKit is the elder of the twins.


Mumm-Ra (voice by Earl Hammond) - The chief villain and antagonist against the ThunderCats, the demon-priest 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 anthropomorphic statues, resembling oversized twisted mockeries of Egyptian canopic jars, 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 famous 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 second season began, 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. Mentioned in the second episode (and other times through out the series), Mumm-Ra is said to pay a price for leaving the pyramid, but exactly what this price was is never made clear.

In later episodes, while endowing Mumm-Ra with his powers, the statues of the Ancient Spirits of Evil come down from their perches, extend their arms over him as the powers of evil flow into Mumm-Ra.

He also assumes alias forms to deceive the ThunderCats on various occasions. Among these are: Diamondfly (the episode "Queen of Eight Legs"), Gregory Gregion (in the episode "All That Glitters"), Silky (in "The Garden of Delights"), The Netherwitch (in "The Astral Prison"), Pumm-Ra (in the episode "Pumm-Ra"). He once took the form of King Arthur to acquire the legendary magic sword Excalibur, using it against the Sword of Omens.

In several episodes, Mumm-Ra has an even more powerful form beyond "Mumm-Ra the Ever-Living" called "Mumm-Ra the All-Powerful": in this manifestation, Mumm-Ra absorbs the entire power of the Ancient Spirits of Evil to become grander in size and strength, and the design pattern on his loin cloth changes, as does his voice (this form is only presented in the series twice). In another incarnation, calling himself "Mumm-Ra the Dream Master," he is able to enter dreams to subliminally influence the ThunderCats in their sleep as a form of mind control.

Mumm-Ra is regarded as immortal, and when defeated or "killed," he simply returns to his sarcophagus. Mumm-Ra cannot be truly killed even in cases where his body is destroyed he will eventually be restored, as he often states: "Wherever evil exists, Mumm-Ra lives!"

Later, Mumm-Ra is shown to have a blue bulldog companion named Ma-Mutt, capable of flight and supernatural feats of strength and speed. He is generally evil, though some episodes depict him as having sympathetic qualities.

An absolute master of both arcane and clerical magic; Mumm-Ra possesses nearly unlimited knowledge of, and experience with, numerous mystical arts from all corners of the universe. As such, he can summon their use to assist him in almost any manner he chooses, most commonly being: flight by self-levitation, necromancy, alchemy, transmogrification, temporal manipulation, teleportation, telekinesis, mind-control, astral projection, scrying, energy blasts.

While in the form of Mumm-Ra the Ever-Living, he becomes a conduit for the Ancient Spirits of Evil; such that he can amplify his aforementioned abilities to a nearly cosmic scale, gain superhuman strength, as well as retain his un-dead status despite the passage of time or any injuries sustained. The price of this power however, is extremely limited stamina: once Mumm-Ra the Ever-Living has surpassed a given threshold of energy-expenditure, he must revert back to his mummified form, and enter his sarcophagus to rejuvenate himself. It should also be noted that Mumm-Ra's power in his Ever-Living form is directly linked to the condition of both his sarcophagus and the Ancient Spirits' four statues within his pyramid; should any of them be harmed or destroyed, his power weakens immediately and considerably.




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Genre Action
Created by Rakin/Bass Production
Voices of Earl Hammond
Earle Hyman
Larry Kenney
Lynne Lipton
Bob McFadden
Peter Newman
Doug Preis
Gerianne Raphael
Narrated by  
Counrty of origin United States
No. of episodes 130
Running Time) 22 mins.
Original Run January 23, 1985 – 1990
Language English



1. Exodus
2. The Unholy Alliance
3. Berbils
4. The Slaves of Castle Plun-darr
5. Trouble With Time
6. Pumm-Ra
7. The Terror of Hammerhand
8. The Tower of Traps
9. The Garden of Delights
10. Mandora: Evil Chaser
11. The Ghost Warrior
12. The Doom-Gaze
13. Lord of the Snows
14. The Spaceship Beneath the Sands
15. The Time Capsule
16. The Fireballs of Castle Plun-Darr
17. All that Glitters
18. Spitting Image
19-23. Lion-O's Annointment (5 part series)
24. Mongor
25. Return to Thundera
26. Snarf Takes up the Challenge
27. Mandora and the Pirates
28. The Crystal Queen
29. Safari Joe
30. Return of the Driller
31. Turmagar the Tuska
32. Sixth Sense
33. Dr. Dometone
34. The Astral Prison
35. Queen of 8 Legs
36. Dimension Doom
37. The Rock Giant
38. The Thunder-Cutter
39. Mechanical Plague
40. The Demolisher
41-42. Feliner (2 parts)
43. Excalibur
44. The Secret of the Ice King
45. Sword in the Hole
46. The Wolfrat
47. Good and Ugly
48. Divide and Conquer
49. Micrits
50. The Super-Power Potion
51. The Evil Harp of Char-Nin
52. Tight Squeeze
53. Monkian's Bargain
54. Out of Sight
55. Jackalman's Rebellion
56. The Mountain
57. Eye of the Beholder
58. The Mumm-ra Berbil
59. Trouble With Thunderkittens
60. Mumm-Rana
61. Trapped
62. The Transfer
63. The Shifter
64. Dream Master
65. Fond Memories


66-70. Thundercats HO! The Movie (5 part series) (1986)
71-75. Mumm-Ra Lives! (5 part series)
76. Catfight
77. Psych Out
78. The Mask of the Gorgon
79. The Mad Bubbler
80. Together We Stand
81. Ravage Island
82. Time Switch
83. Sound Stones
84. Day of the Eclipse
85. Side Swipe
86. Mumm-Rana's Belt
87. Hachiman's Honor
88. Runaways
89. Hair of the Dog
90. Vultureman's Revenge


91-95. Thundercubs! (5 part series)
96. The Totem of Dera
97. The Chain of Loyalty
98. Crystal Canyon
99. Telepathy Beam
100. Exile Isle
101. Key of Thundera
102. Return of the Thundercubs
103. The Formula
104. Locket of Lies
105. Bracelet of Power
106. The Wild Workout
107. The Thunderscope
108. The Jade Dragon
109. The Circus Train
110. The Last Day


111-115. Return to Thundera (5 part series)
116. Leah
117. Frogman
118. The Heritage
119. Screw Loose
120. Malcar
121. Helpless Laughter
122. Cracker's Revenge
123. The Mossland Monster
124. Mu-Mutt's Confusion
125. The Shadowmaster
126. Swan Song
127. The Touch of Amorus
128. The Zazz Factor
129. Well of Doubt
130. Book of Omens