From beyond any known galaxy, bring with them the laws and ideals of their doomed planet, Thundera, come the ThunderCats.
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The Mutants form an unholy alliance with Mumm-Ra and set forth to destroy the ThunderCats.
The ThunderCats meets the Berbils, a group of robot teddy bear-like creatures from the planet Ro-Bear.
The ThunderTank is given a trial run as the ThunderCats attempts to liberate the Brutemen from slavery.
Mumm-Ra changes into a puma and stages a fake heroic deed in order to convince the ThunderCats that he's from their home planet.
The Code Of Thundera is called into action as Lion-O saves a unicorn from the Berserkers and their leader, Hammerhead.
Searching for Thundrillium, the ThunderTank's power sources, Tygra is caught in the Cave of Time, aging him rapidly and making him too weak to escape.
Wilykit and Wilykat help a friendly Wollo who is being robbed by two gargoyle-like creatures. During the chase, Wilykat is caught in Baron Karnor's Tower of Traps.
While investigating a series of earthquakes, Tygra falls into the earth and confronts a giant worm head in the world of the Mole People.
Mandora of the interplanetary Control Force enlists Lion-O and Snarf to pursue three criminals they unwittingly released from her cell sled.
While looking for valuables in an abandoned tomb, two Bolkins accidentally release a ghostly renegade named Grune.
Mumm-Ra allies with the Egyptian princess Ta-She to gain the Doomgaze, an entrancing power which could enslave the ThunderCats.
The ThunderCats track a falling Meteor of Thundrillium, their power source, to Hook Mountain, the icy landscape ruled by Snowman and his giant cat, Snowmeow.
Mumm-Ra raises the Mutants' buried spaceship from beneath the Desert Of Sinking Sands.
Jaga tells the homesick Lion-O that the Time Capsule containing the history of Thundera is still intact somewhere on Third Earth.
The Mutants bombard the Warrior Maidens' Treetop Kingdom with liquid fireballs mechanically launched from their new Firethrower.
Mumm-Ra transforms himself into a troll named Grygory Grygion and tricks Lion-O into attacking Tygra and breaking the Sword of Omens.
Mumm-Ra calls upon the Driller to kidnap Panthro with the aid of a sleeping potion.
Wilykat and Wilykit explore the Ruined Temple. They move a hexagonal rock and unwittingly free Mongor, the external image of fear.
The Mutants create Warbot, a Plun-Darrian war robot, to destroy Cats' Lair.
While swimming, Wilykat is apparently devoured by an amphibious monster, which is actually a robot belonging to Dr. Dometone.
Jaga is captured by Nemex, the Astral Imprisoner and only Lion-O can save him.
Tartana, the Crystal Queen, steals the Ariettabird and cages it in her Crystal Kingdom. The Ariettabird's beautiful song brings a fruitful harvest to the Berbils and without it, their crops will die.
Safari Joe, an intergalactic Big Game Hunter, arrive on Third Earth to hunt the ThunderCats.
Snarf searches the Cats' Lair and discovers all the ThunderCats have been captured by the Mutants.
A damaged alien spaceship makes contact with Cheetara's Sixth Sense. The telepathic communication drains her strength and she ages rapidly.
Infuriated by the Mutants' excuse that the Sword of Omens is invincible, Mumm-Ra summons Rachiman, a legendary Samurai, and his sword, the Thunder-Cutter.
Mum-Ra has a phial of miniaturization gas. Vultureman builds a mechanical wolfrat to infiltrate the gas into the Cats' Lair.
Ratar-O, the most powerful of all the Mutant Warlords, comes to Third Earth and takes control of the Mutants.
The ThunderCats have almost completed their spacecraft, the Feliner, but can't make it fly because they lack a Megacondensor.
Officer Mandora arrests the renegade robot Cracker and takes his Space Freighter to the Grey Planet Prison. Cracker traps her and releases all the prisoners.
Mumm-Ra summons the Driller to destroy the Cats' Lair by drilling a tunnel from the Acid lake to the Lair's foundations.
Wizz-Ra appears before Cheetara. Disturbed by him, she considers asking the other ThunderCats for advice, but fears they will ridicule her.
Disguising himself as a helpless Diamondfly, Mumm-Ra entices Lion-O into the monstrous domain of Spidera, Queen of Eight Legs.
An S.O.S. from the edge of a Black Hole in deep space sends Lion-O, Snarf, and Cheetara out in the Feliner.
The ThunderKittens discover a magical Harp, strum it, and release Charr-Nin, a genie imprisoned inside. Mumm-Ra promises the genie freedom if he'll destroy the ThunderCats.
Lion-O awakes on his birthday to learn that he has come of age and must undergo the Anointment Trials, a ritual every Lord of ThunderCats has had to survive from the beginning of history.
The Demolisher is a mercenary who seeks violence for violence's sake and fights without regard for any principals.
Mumm-Ra summons Monikan to his pyramid to strike a bargain - if Monikan steals the Sword of Omens, Mumm-Ra will make him a ruler over part of Third Earth.
Mumm-Ra seals the Sword Chamber which contains all the ThunderCats' weapons inside.
While searching for Thundrillium, Lion-O discovers that there is a tribe of tiny people on Third Earth.
Lion-O undergoes his second test in the Anointment Trial which he must pass to remain Lord of the ThunderCats.
A volcanic eruption releases the Rock Giant, a huge lava monster.
Jackalman steals Vultureman's Flying Machine and attacks Lion-O and Panthro in the ThunderTank.
Turmagar, a walrus-like humanoid, crash-lands his Gomplin at the Cats' Lair and asks for help.
Lion-O undergoes the third installment of his Anointment Trials to prove he is worthy of his inherited title.
Angry with the Mutants' failure to destroy the ThunderCats, Mumm-Ra transforms them into a meek Berbil and tricks Snark into bringing him inside the Cats' Lair.
Panthro invents Holograph-Recorders to film the ThunderCats' experiences on Third Earth for incorporation into a time capsule through which future generations can learn.
Cheetara and Tygra are aboard the Feliner when it is caught in a galactic meteor shower and badly damaged.
Lion-O undergoes the fourth task in his Anointment Trial.
The story of Excalibur, the greatest sword in history, is revealed to Mumm-Ra, who is then determined to find the Excalibur and defeat Lion-O and the Sword of Omens.
A giant Ice King is accidentally released from his glacial prison and attacks the Castle of the Snowmen.
A Terator Starship, an extremely ugly spaceship manned by the ugly Terator, is pursued by a Kymera Craft, a visually appealing spaceship, manned by the beautiful Kymera. The Terator Spaceship escapes and lands at the Cats' Lair, where Lion-O assumes it is evil and attacks.
A spaceship freighted with a lethal radioactive sphere is on a collision course for Third Earth.
Vultureman invents a Voice Imitator which imitates the ThunderCats' voices. He uses it to lure the ThunderCats into perilous situations.
Mumm-Ra transforms into Mumm-Ra the Dream Master and summons spectral Dream Selves from the sleeping Panthro, Cheetara, Tygra, Wilykat, and Wilykit.
Willa is practicing her long-bow skills when a warning device alerts her to a Mutant attack Willa is captured and the ThunderCats rush to rescue her.
Mumm-Ra summons the Mutants and threatens to banish them from Third Earth unless they bring him the Sword of omens.
Vultureman invents a Super Power Potion which give him magical powers, enabling him to mesmerize and defeat Tygra.
Jackalman ambushes Snark and attempts to steal the Sword of Omens. This gives Panthro the idea to make a duplicate sword as bait for the Mutants.
The concluding trial in Lion-O's Anointment Trials pits him alone and weapon-less against the evil Mumm-Ra.
To prove themselves worthy of being ThunderCats, the ThunderKittens borrow the other ThunderCats' weapons and practice with them. They are ambushed by Mutants, who take their weapons.
The Feliner is attacked by the RatStar, manned by the Mutants. Jackalman, Monikan, and S-S-Slithe are ejected and saved by Mumm-Rana, a female mirror image of Mumm-Ra, who is a force for good.
Vultureman invents the Shifter, a device that can switch personalities and uses it on Panthro's personality and Snarf's body.
Mumm-Ra creates a museum where painting and statues come alive to oppose the ThunderCats.