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The Best Episodes of ThunderCats

Every episode of ThunderCats ranked from best to worst. Let's dive into the Best Episodes of ThunderCats!

Binge this in 1d 23h•Peaking at 8.2/10

The inhabitants of the planet Thundera evacuate just before it is destroyed. They were pursued by a band of mutants. All but one of their escape ships was destroyed. Only a small group of Thunderians

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  1. #1 Fan Favorite
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    ThunderCats Season 1 Episode 61 - Lion-O's Anointment Final Day: The Trial of Evil
    8.2/10(219 votes)

    S1:E61

    The concluding trial in Lion-O's Anointment Trials pits him alone and weaponless against the evil Mumm-Ra.

    Director:Unknown
    Writer:Leonard Starr

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  2. ThunderCats Season 1 Episode 42 - Lion-O's Anointment Second Day: The Trial of Speed
    8.1/10(234 votes)

    S1:E42

    On the second day of his trials, Lion-O must race Cheetara through the dangerous lands of Third Earth. Although Cheetara is by far the fastest among the Thundercats, her speed can only last for a short time period. Lion-O takes a shorter but more dangerous route to make up for Cheetara's advantage.

    Director:Unknown
    Writer:Leonard Starr

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  3. ThunderCats Season 3 Episode 20 - The Last Day
    8.1/10(210 votes)

    S3:E20

    With the Mutants and Lunataks gone, the Ancient Spirits of Evil give Mumm-Ra until sunset to destroy all the Thundercats, and to prove they're not bluffing, they exile Ma-Mutt. Mumm-Ra spreads destruction all over Third Earth, sends Tygra, Cheetara, and Panthro to limbo, and buries Lion-O alive. Then he attacks and destroys the Tower of Omens, and the Thunderkittens barely escape, but Mumm-Ra sends them to limbo too. Snarf must go into the Book of Omens to find out how to defeat Mumm-Ra. Jaga and the Thundercats in limbo go into the Eye of Thundera to help Lion-O free himself from his rocky prison. Lion-O then battles Mumm-Ra at Cats Lair and finds out from Snarf that Mumm-Ra only has until sunset to defeat the Thundercats. Mumm-Ra fails and the Ancient Spirits of Evil banish and exile Mumm-Ra from Third Earth. With all their enemies gone, the Thundercats decide to permanently return to New Thundera

    Director:Unknown
    Writer:J. Larry Carroll

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  4. ThunderCats Season 1 Episode 20 - Return to Thundera
    8.0/10(247 votes)

    S1:E20

    The Thundercats briefly show Lion-O how the time capsule they recovered from the caveman works. Curious to see more, Lion-O activates it during his night-time watch, and gets caught in its projection rays. The rays send him back in time to Thundera, just before the final tremor that destroyed the planet. Meanwhile, the Mutants have built an evil robot monster that is destroying Cats' Lair. Back on Thundera, Lion-O encounters his father, Claudus, and saves him from a Mutant attack. In return, Claudus gives Lion-O the plans to the robot that was attacking the Thundercats in his own time.

    Director:Unknown
    Writer:Bob Haney

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  5. ThunderCats Season 1 Episode 37 - Lion-O's Anointment First Day: Trial of Strength
    8.0/10(228 votes)

    S1:E37

    On Lion-O's 20th birthday, he must pass a set of trials to become the true Lord of the ThunderCats. Even though he is the hereditary Lord of the ThunderCats, he must prove himself to be worthy of that title. His first test is to beat Panthro in a duel to test his strength.

    Director:Unknown
    Writer:Leonard Starr

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  6. ThunderCats Season 2 Episode 25 - Vultureman's Revenge
    8.0/10(193 votes)

    S2:E25

    Vultureman builds a Thundranium[28] projector, capable of creating concentrated regions of Thundranium. When the ThunderKittens damage it, he damages their spaceboard, sending them off into danger. While Lion-O and Snarf search desperately for them, Vultureman plans his revenge.

    Director:Unknown
    Writer:Herb Engelhardt

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    The 20 WORST Episodes of ThunderCats

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  7. ThunderCats Season 1 Episode 11 - The Ghost Warrior
    7.9/10(282 votes)

    S1:E11

    Two Bolkins (sheep-like beings from Third Earth) unleash the ghost of Grune the Destroyer, a renegade Thundercat who once terrorised Third Earth and now turns his attention to the Thundercats.

    Director:Unknown
    Writer:Leonard Starr

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  8. ThunderCats Season 1 Episode 24 - Safari Joe
    7.9/10(237 votes)

    S1:E24

    An evil hunter lands on third earth in search of prey to hunt. His holographic machine can tell him about all of the Thundercats, including their strengths and weaknesses, and he is able to hunt down each one of them and put them in Thundrainium cells. He captures all of them but Lion-O and Snarf. Jaga warns Lion-O about Safari Joe before he sets out to save his comrades, and Lion-O is able to defeat him and release his friends.

    Director:Unknown
    Writer:Steve Perry

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  9. ThunderCats Season 1 Episode 50 - Lion-O's Anointment Fourth Day: The Trial of Mind Power
    7.9/10(225 votes)

    S1:E50

    Lion-O undergoes the fourth task in his Anointment Trial.

    Director:Unknown
    Writer:Leonard Starr

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  10. ThunderCats Season 1 Episode 51 - Excalibur
    7.9/10(230 votes)

    S1:E51

    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.

    Director:Unknown
    Writer:Peter Lawrence

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  11. ThunderCats Season 2 Episode 21 - Mumm-Rana's Belt
    7.9/10(199 votes)

    S2:E21

    Luna discovers that her grandmother's magic belt is now in the possession of Mumm-Rana, who claimed it after battle. She heads straight for the white pyramid, with Pumyra hot on her tail.

    Director:Unknown
    Writer:James Rose

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  12. ThunderCats Season 2 Episode 22 - Hachiman's Honor
    7.9/10(195 votes)

    S2:E22

    While Hachiman is on his way to the Tower of Omens, Luna steals his sword, the ThunderCutter, and gives it to an automaton. Lion-O and the ThunderKittens head out to find their old friend.

    Director:Unknown
    Writer:J. Larry Carroll

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  13. ThunderCats Season 2 Episode 24 - Hair of the Dog
    7.9/10(193 votes)

    S2:E24

    While all the ThunderCats except Lion-O are gone, Mumm-Ra switches Ma-Mutt with Snarf. Ma-Mutt poisons Lion-O, allowing Mumm-Ra to move in.

    Director:Unknown
    Writer:Chris Trengove

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  14. ThunderCats Season 1 Episode 25 - Snarf Takes Up the Challenge
    7.8/10(227 votes)

    S1:E25

    Nearly all the Thundercats have been captured by the Mutants and imprisoned in Mumm-Ra's Pyramid, forcing Snarf to use his own talents to free them.

    Director:Unknown
    Writer:Peter Lawrence

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  15. ThunderCats Season 1 Episode 46 - Lion-O's Anointment Third Day: Trial of Cunning
    7.8/10(222 votes)

    S1:E46

    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.

    Director:Unknown
    Writer:Leonard Starr

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  16. ThunderCats Season 2 Episode 23 - Runaways
    7.8/10(192 votes)

    S2:E23

    Fed up of feeling useless, Wilykat convinces his twin to run away from home, but living on their own is more dangerous than they realized. The other ThunderCats search desperately to find them as they all must learn a lesson in communication.

    Director:Unknown
    Writer:Bill Ratter

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  17. ThunderCats Season 3 Episode 5 - ThunderCubs (5)
    7.8/10(192 votes)

    S3:E5

    Lion-O frees the Thundercubs from Mumm-Ra's spell and the Thundercubs safely leave New Thundera. Lion-O and Snarf must confront Mumm-Ra and get the Book of Omens. After they defeat Mumm-Ra, they ask Mu-Mutt (using a magical flute) to use Mumm-Ra's ""device"" to get them back to Third Earth. Meanwhile the Lunataks capture some Berbils and the Thundercubs return to Third Earth and they and the Thunderkittens must go to Sky Tomb to free the other Thundercats and the Berbils. After everyone is freed, they are all cornered by the Lunataks, but Lion-O and Snarf arrive to save the day. The Thundercubs must then go in the Cave of Time to become Thundercats again and Mumm-Ra is abandoned on New Thundera and the Ancient Spirits bring him back to Third Earth.

    Director:Unknown
    Writer:Peter Lawrence

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  18. ThunderCats Season 3 Episode 11 - Key to Thundera
    7.8/10(194 votes)

    S3:E11

    While trying to figure out a way to read the Book of Omens, Lion-O tries looking through the sword at the book. He is immediately drawn into the book, where a voice asks him if he has ""the key."" Lion-O says he doesn't, and four dragon heads appear and shoot fire at him. Snarf, who saw Lion-O get sucked into the book, tries to show Cheetara what happened, and he too gets sucked in. Mumm-Ra, who also watched Lion-O get sucked in, goes to cats lair and takes the book so he can destroy it with Lion-O inside. Meanwhile, just by coincidence, Panthro finds an odd looking key on Thundera. He and Tygra head back to Third Earth with the key, not knowing what it's for. Back on Third Earth, Mumm-Ra is just about to boil the book when Lion-O calls for the sword, and it brings him and Snarf back outside. Mumm-Ra takes the sword and looks through it at the book, and he gets sucked in! But Lion-O has to save him because of the code of Thundera, and Lion-O does save him. Panthro and Tygra arrive with t

    Director:Unknown
    Writer:Matthew Malach

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  19. ThunderCats Season 1 Episode 7 - Trouble with Time
    7.7/10(283 votes)

    S1:E7

    With their supply of Thundrillium running low, the Thundercats set off in search of a fresh supply. Tygra detects a large deposit in a cave and goes to investigate - unfortunately, he has entered the Cave of Time and anyone who ventures in there will age rapidly until they die. His only hope is that Cheetara's speed will be fast enough to allow her to escape the Cave's effects.

    Director:Unknown
    Writers:Ron Goulart, Jules Bass

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  20. ThunderCats Season 1 Episode 13 - Lord of the Snows
    7.7/10(251 votes)

    S1:E13

    When a meteorite made of pure Thundrillium crashes on Hook Mountain, the Thundercats decide to use it to replenish their depleted energy supply. But Lion-O must first gain the trust of the fierce Snowman.

    Director:Unknown
    Writer:Bob Haney

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  21. ThunderCats Season 1 Episode 17 - All That Glitters
    7.7/10(240 votes)

    S1:E17

    Mumm-Ra tricks Lion-O into using the Sword of Omens against Tygra, causing the blade to break in half and lose its powers. The only way Lion-O can restore the Sword is to venture into a volcano and have the Inflamer reforge it. But the Inflamer requires a payment of gold... Has Lion-O taken on more than he can handle?

    Director:Unknown
    Writer:Bob Haney

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  22. ThunderCats Season 1 Episode 18 - Spitting Image
    7.7/10(241 votes)

    S1:E18

    Mumm-Ra creates device that can make Panthro clones. He embeds the spirit of Hammerhand into his clone and sets it free to destroy Third Earth. The Third Earth inhabitants blame the Thundercats for the terror because they think its the real Panthro destroying their villages and burning their crops. The real Panthro finally encounters his clone and, with the help of Lion-O, manages to destroy it. Enraged about his defeat, Hammerhand destroys Mumm-Ra's cloning device.

    Director:Unknown
    Writer:Howard Post

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  23. ThunderCats Season 1 Episode 29 - Feliner (1)
    7.7/10(219 votes)

    S1:E29

    Vultureman summons Ratar-O to take him to the planet of the Snarfs to capture one of them and use it as ransom with the Thundercats. Snarf, thinking his entire race was wiped out when Thundera blew up, finds out that they have captured Snarfer, his little nephew. The Thundercats set out to find the Mutants and save Snarfer. After successfully saving Snarfer, the Thundercats are faced with the problem of returning Snarfer to his planet. Panthro cleverly invents the Feliner, a spaceship. In order for it to work, though, the machine need a hyperspace mega-condenser. Snarf reminds him that there is one on Ratar-O's Ratstar. The Thundercats once again pursue the Mutants to the wreckage site of the Ratstar to take their mega-condenser.

    Director:Unknown
    Writer:Steve Perry

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  24. ThunderCats Season 1 Episode 47 - The Mumm-Ra Berbil
    7.7/10(214 votes)

    S1:E47

    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.

    Director:Unknown
    Writer:Jeri Craden

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  25. ThunderCats Season 1 Episode 57 - Out of Sight
    7.7/10(213 votes)

    S1:E57

    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.

    Director:Unknown
    Writer:Chris Trengove

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Best Episodes Summary

"Lion-O's Anointment Final Day: The Trial of Evil" is the best rated episode of "ThunderCats". It scored 8.2/10 based on 219 votes. Directed by Unknown and written by Leonard Starr, it aired on 12/16/1985. This episode scored 0.1 points higher than the second highest rated, "Lion-O's Anointment Second Day: The Trial of Speed".