Seasons & episodes
S1 · E44Jackalman's Rebellion 1985-11-21 · 22 min
The normally submissive JackalMan decides to start his own army in hopes of conquering Third Earth by himself. He does manage to give the Thundercats trouble, but soon he is defeated and ends up crawling back to the other mutants at Castle Plundarr, who weren't very happy that he rebelled in the first place.
S1 · E45Turmagar the Tuska 1985-11-22 · 22 min
An evil robot monster is attacking the Tuska Village, in an area unexplored by the Thundercats. Turmagar, the leader of the Tuskas, travels to the Cat's Lair to ask for aid in defeating the Techno-Pede robot which is destroying his village. The Thundercats agree to help Turmagar, and set out to the Tuska Village.
S1 · E46Lion-O's Anointment Third Day: Trial of Cunning 1985-11-25 · 22 min
Wily Kit and Kat stand in Lion-O's way on the third day of his trials. Lion-O must beat them through the maze of infinity. Attempting to stop Lion-O and slow him down, the kids set traps in the maze. He manages however to avoid their traps. In order to beat them through the maze, Lion-O plays their own tricks on them, and tricks them into losing the race through the maze.
S1 · E47The Mumm-Ra Berbil 1985-11-26 · 22 min
Mumm-ra transforms himself into a ro-bear berbil (a Thundercat ally). He acts hurt and the Thundercats let him stay at Cats Lair. One night, Mumm-ra(the berbil) puts all the Thundercats under his spell, except Snarf, because Tygra held off Mumm-ra just long enough for Snarf to escape. Lion-O was sleeping out in the woods, and Snarf ran to him and told him what happened. Lion-O came back and fought Mumm-ra, who was actually beating Lion-O. Mumm-ra was wearing special glasses so he couldn't see his reflection. Eventually, Lion-O used the Thundercat signal, broke Mumm-ra's spell and his glasses, and finally defeated him with his reflection.
S1 · E48Mechanical Plague 1985-11-27 · 22 min
Panthro invents flying video cameras which are suppose to record the events that take place on third-earth so they could create their own holographic time capsule. Mumm-Ra, in hope of destroying the Thundercats once more, revives the great mechanical monsters which the Thundercats have destroyed in the past to attack them. He revives the Mutant War robot, The Driller, The Giant Insect, and the Techno-Pede.
S1 · E49Trapped 1985-11-28 · 22 min
When a big storm hits Third Earth, the Thunderkittens are trapped in an old space capsule. Meanwhile, Tygra and Cheetra almost crash the Feliner, but Lion-O guides them in for a safe landing with the eye of Thundera. The kittens are captured by Mumm-ra, but end up saving the day by showing him his reflection in the window of the capsule.
S1 · E50Lion-O's Anointment Fourth Day: The Trial of Mind Power 1985-11-29 · 22 min
Lion-O undergoes the fourth task in his Anointment Trial.
S1 · E51Excalibur 1985-12-02 · 22 min
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.
S1 · E52Secret of the Ice King 1985-12-03 · 22 min
A giant Ice King is accidentally released from his glacial prison and attacks the Castle of the Snowmen.
S1 · E53Good and Ugly 1985-12-04 · 22 min
A Terator Starship, an extremely ugly spaceship, is pursued by a Kymera Craft, a visually appealing spaceship. The Terator Spaceship escapes and lands at the Cats' Lair
S1 · E54The Transfer 1985-12-05 · 22 min
A spaceship freighted with a lethal radioactive sphere is on a collision course for Third Earth.
S1 · E55Divide and Conquer 1985-12-06 · 22 min
Vultureman invents a voice imitator that imitates the ThunderCats' voices. He uses it to lure the ThunderCats into perilous situations.
S1 · E56Dream Master 1985-12-09 · 22 min
Mumm-Ra transforms into Mumm-Ra the Dream Master and summons spectral Dream Selves from the sleeping Panthro, Cheetara, Tygra, Wilykat, and Wilykit.
S1 · E57Out of Sight 1985-12-10 · 22 min
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.
S1 · E58The Mountain 1985-12-11 · 22 min
Mumm-Ra summons the Mutants and threatens to banish them from Third Earth unless they bring him the Sword of Omens.
S1 · E59The Superpower Potion 1985-12-12 · 22 min
Vultureman invents a Super Power Potion which give him magical powers, enabling him to mesmerize and defeat Tygra.
S1 · E60Eye of the Beholder 1985-12-13 · 22 min
Jackalman ambushes Snarf and attempts to steal the Sword of Omens. This gives Panthro the idea to make a duplicate sword as bait for the Mutants.
S1 · E61Lion-O's Anointment Final Day: The Trial of Evil 1985-12-16 · 22 min
The concluding trial in Lion-O's Anointment Trials pits him alone and weaponless against the evil Mumm-Ra.
S1 · E62The Trouble with ThunderKittens 1985-12-17 · 22 min
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.
S1 · E63Mumm-Rana 1985-12-18 · 22 min
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.
S1 · E64The Shifter 1985-12-19 · 22 min
Vultureman invents the Shifter, a device that can switch personalities, and uses it on Panthro's personality and Snarf's body.
S1 · E65Fond Memories 1985-12-20 · 22 min
Mumm-Ra creates a museum where painting and statues come alive to oppose the ThunderCats.
S2 · E1ThunderCats Ho! (1) 1986-09-08 · 22 min
Recurring nightmares of Thunderians killed on Thundera as he fled to safety with Jaga and the other ThunderCats awaken Lion-O. Jaga comes to tell him that they in fact survived and are living on Third Earth. After meeting with the other ThunderCats, they decide to begin searching for them but Mumm-Ra has plans as well.
S2 · E2ThunderCats Ho! (2) 1986-09-09 · 22 min
Lion-O's rescue attempt fails and the captured Thunderians are taken to Fire Rock Mountain after another failed attempt on their part to break free from their captors.