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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!

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 Thunderans (Thundercats) remained. With only half engine power, the group, which was led by Jaga, had to set a course for the nearest planet. Jaga commanded their ship while the other seven were in their stasis tubes. Jaga died on their journey to Third Earth and their ship crashed there. Soon they made friends with various groups in the area and they designed a fortress. Mumm-Ra the centuries-old embodiment of evil, along with the mutants that destroyed the rest of the Thunderans are a constant threat. But Lion-O, the new leader of the Thundercats, with his weapon the "Sword of Omens" will help the Thundercats to have a standing chance.

Genres:AnimationSci-Fi & FantasyAction & Adventure

Top Episode Highlight

The best episode of "ThunderCats" is "Catfight", rated 8.7/10 from 119 user votes. It was directed by N/A and written by Chris Trengove. "Catfight" aired on 9/14/1987 and is rated 0.0 point(s) higher than the second highest rated, "ThunderCubs (3)".

  • Catfight
    8.7/10 119 votes

    #1 - Catfight

    Season 2 Episode 11 - Aired 1987-09-14

    Mumm-Ra uses the Beacon of Ravage Island to make the Thundercats his slaves. When the beacon puts Lion-O, Panthro, Cheetara, and Pumyra under its power, they are easily captured by the Mutants, and Snarf must get the others at the tower for help, but Ben-Gali soon falls under the beacon's power and it's up to Lynx-O, Snarf and Snarfer, to save the "enslaved" Thundercats.

    Director: N/A

    Writer: Chris Trengove

  • ThunderCubs (3)
    8.7/10 119 votes

    #2 - ThunderCubs (3)

    Season 3 Episode 3 - Aired 1988-09-07

    Mumm-Ra retrieves the Sword of Plundarr and the Thundercats arrive on New Thundera. While the Thundercats want to get the Sword and treasure, Snarf and Snarfer want to free their fellow snarfs. While the Thundercats sleep, Snarf and Snarfer sneak away, but are discovered and captured by Mumm-Ra. He disguises himself as Snarfer and he leads the Thundercats to where the treasure is located, but it can only be freed by the Sword of Omens. Once the treasure is freed, Mumm-Ra reveals himself and defeats the Thundercats with the Sword of Plundarr. Now Mumm-Ra possesses the Sword of Plundarr and the Treasure of Thundera

    Director: N/A

    Writer: Peter Lawrence

  • The Heritage
    8.6/10 118 votes

    #3 - The Heritage

    Season 4 Episode 8 - Aired 1989-09-13

    Wily Kit and Kat, exploring New Thundera, stumble upon an Orb of Gold, and pick it up thinking that it is apart of their Heritage. Possessed by the power of the Golden Sphere of City, the ThunderKittens get greedy, and let the power of the orb overcome them. Mumm-Ra manages to get a hold of the orb, and his powers get four times more powerful. He gets so powerful, he destroys the Sword of Omens. Jar, the scrap metal collector reforges it for Lion-O. He gets so powerful that he challenges the power of the ancient spirits of evil. They lock him out of his pyramid until he surrenders the Orb to them. The spirits of evil let him back in, but destroy the Golden Sphere of City.

    Director: N/A

    Writer: Peter Lawrence, Bill Ratter

  • Lion-O's Anointment Second Day: The Trial of Speed
    8.2/10 152 votes

    #4 - Lion-O's Anointment Second Day: The Trial of Speed

    Season 1 Episode 42 - Aired 1985-11-19

    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: N/A

    Writer: Leonard Starr

  • The Last Day
    8.2/10 129 votes

    #5 - The Last Day

    Season 3 Episode 20 - Aired 1988-09-30

    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: N/A

    Writer: J. Larry Carroll

  • Return to Thundera
    8.1/10 168 votes

    #6 - Return to Thundera

    Season 1 Episode 20 - Aired 1985-10-04

    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: N/A

    Writer: Bob Haney

  • Lion-O's Anointment First Day: Trial of Strength
    8.1/10 155 votes

    #7 - Lion-O's Anointment First Day: Trial of Strength

    Season 1 Episode 37 - Aired 1985-11-12

    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: N/A

    Writer: Leonard Starr

  • Hair of the Dog
    8.1/10 123 votes

    #8 - Hair of the Dog

    Season 2 Episode 24 - Aired 1987-10-01

    With only Lion-O and Snarf guarding the Lair, Mumm-Ra decides this is a perfect opportunity to invade the Lair, so Ma-Mutt captures Snarf and Mumm-Ra switches Snarf and Ma-Mutt. Ma-Mutt (who now looks like Snarf) goes to Cats Lair and gives Lion-O some poisoned candy fruit. Lion-O becomes ill and realizes that this Snarf is really Ma-Mutt and Mumm-Ra arrives and defeats Lion-O. Snarfer's bad dream of Snarf becoming a dog causes him, Ben-Gali, and Pumyra to go to Cats Lair, but Mumm-Ra lays a trap for them. He sends Ma-Mutt to get Snarfer and Lion-O becomes better again and distracts Mumm-Ra. When Lion-O summons the other Thundercats, Snarf (who looks like Ma-Mutt now), using Mumm-Ra's chant that changes Mumm-Ra into the everliving, becomes... Snarf-Ra the everliving and he rescues Ben-Gali, Pumyra and they in turn rescue Snarfer from Ma-Mutt. Then Snarf-Ra challenges Mumm-Ra and defeats him. After the battle is over, Lion-O uses the sword to restore Snarf to his original state.

    Director: N/A

    Writer: Chris Trengove

  • Vultureman's Revenge
    8.1/10 123 votes

    #9 - Vultureman's Revenge

    Season 2 Episode 25 - Aired 1987-10-02

    Vultureman creates a weapon that shoots pure Thundrainium in hopes of destroying the Thundercats. His first victims are the Thunderkittens who fall into a deep cavern and become injured. Lion-O and Snarf search for the missing kittens. Meanwhile Vultureman must get more Thundrainium from Chilla in Darkside and is also ordered by Slithe to fix the Mutants' machines. The Thunderkittens are saved by a Wollo and they discover that the Wollo village has been ""iced"" and they are captured and used as bait to lure Lion-O. When Lion-O and Snarf arrive, they are shot down by Vultureman's weapon and Lion-O becomes weak and summons the Thundercats. Just as Vultureman is about to finish off Lion-O, Ben-Gali arrives, wrecks Vultureman's weapon and drives the Mutants and Chilla away. Lion-O then uses the sword to restore the Wollo village.

    Director: N/A

    Writer: Herb Engelhardt

  • Safari Joe
    8.0/10 154 votes

    #10 - Safari Joe

    Season 1 Episode 24 - Aired 1985-10-10

    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: N/A

    Writer: Steve Perry

  • Lion-O's Anointment Fourth Day: The Trial of Mind Power
    8.0/10 150 votes

    #11 - Lion-O's Anointment Fourth Day: The Trial of Mind Power

    Season 1 Episode 50 - Aired 1985-11-29

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

    Director: N/A

    Writer: Leonard Starr

  • Mumm-Rana's Belt
    8.0/10 131 votes

    #12 - Mumm-Rana's Belt

    Season 2 Episode 21 - Aired 1987-09-28

    After overhearing Snarf telling the Thunderkittens and Pumyra a story about Mumm-Rana's magic belt and Queen Luna (Luna's grandmother), Luna and Amuk journey to the white pyramid and take Mumm-Rana's belt, destroying her pyramid in the process. Pumyra tries to stop her but she gets sealed up in the pyramid. Amuk becomes jealous when Luna no longer needs him and during his ""little temper"", he accidently frees Pumyra. Then Luna forces Slithe and Monkian to help her ambush Lion-O and Panthro. During the battle with ""Princess"" Luna, Lion-O uses the sword to restore Mumm-Rana and she retakes the belt and defeats Luna. Amuk later arrives and destroys the belt.

    Director: N/A

    Writer: James Rose

  • Hachiman's Honor
    8.0/10 129 votes

    #13 - Hachiman's Honor

    Season 2 Episode 22 - Aired 1987-09-29

    Hatchiman rescues an old woman not knowing it's Luna. She "invites" him to her "cave" and there she and Chilla and Aluro attack him and take his sword, the Thundercutter. The Thunderkittens find Hatchiman and rescue him. The Lunataks plan to use the Thundercutter with their new samurai robot, Automaton, to fight Lion-O and the Sword of Omens. The Thundercutter can't tell who's good and who's evil in the fight but when Hatchiman touches the sword, the Thundercutter destroys the robot.

    Director: N/A

    Writer: J. Larry Carroll

  • Runaways
    8.0/10 126 votes

    #14 - Runaways

    Season 2 Episode 23 - Aired 1987-09-30

    Bored and feeling that they are no longer needed, the Thunderkittens run away from home, but soon run into problems when they become ill from berries they had picked. A creature known as Cudi saves their lives. When the other Thundercats find them, the Thunderkittens invite Cudi to Cats Lair. But Mumm-Ra has been observing the situation and disguises himself as Cudi to gain entrance to the Lair. Many disasters occur and the blame is put on the false Cudi, who traps the Thundercats in the council chamber. The Thundercats realize it's Mumm-Ra and they manage to escape and defeat him.

    Director: N/A

    Writer: Bill Ratter

  • The Ghost Warrior
    7.9/10 200 votes

    #15 - The Ghost Warrior

    Season 1 Episode 11 - Aired 1985-09-23

    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: N/A

    Writer: Leonard Starr

  • Snarf Takes Up the Challenge
    7.9/10 150 votes

    #16 - Snarf Takes Up the Challenge

    Season 1 Episode 25 - Aired 1985-10-11

    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: N/A

    Writer: Peter Lawrence

  • Lion-O's Anointment Third Day: Trial of Cunning
    7.9/10 151 votes

    #17 - Lion-O's Anointment Third Day: Trial of Cunning

    Season 1 Episode 46 - Aired 1985-11-25

    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: N/A

    Writer: Leonard Starr

  • ThunderCubs (5)
    7.9/10 122 votes

    #18 - ThunderCubs (5)

    Season 3 Episode 5 - Aired 1988-09-09

    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: N/A

    Writer: Peter Lawrence

  • The Jade Dragon
    7.9/10 121 votes

    #19 - The Jade Dragon

    Season 3 Episode 18 - Aired 1988-09-28

    Mumm-Ra discovers the power of one of the pieces of the treasure of Thundera. The Double-Headed Dragon of Doom, or the Jade Dragon possess the power to entrap people in its stomach. The legend says that Haji-Man's ancestor gave the dragon to his wife as a marriage gift, and since her father was so against their marriage, he put a curse on the dragon and it engulfed Haji-man's ancestor. Jaga freed the him, and he gave the dragon to Jaga for safe keeping. Now, the Thundercats have found the Jade Dragon, and Mumm-Ra manages to trap Lion-O and Cheetara in it. Haji-man is their only hope.

    Director: N/A

    Writer: William Overgard

  • Return to Thundera (1)
    7.9/10 133 votes

    #20 - Return to Thundera (1)

    Season 4 Episode 1 - Aired 1989-09-04

    The Ancient Spirits of Evil give new life to Mumm-Ra and Ma-Mutt, send them to New Thundera, and build a new Pyramid for Mumm-Ra. The Thundercats say goodbye to Third Earth and depart for Thundera, leaving Tygra and Pumyra behind to watch Cat's Lair and the Tower of Omens. The Thundercats soon arrive and begin plans to build a new lair. Mumm-Ra meanwhile learns that the planet's gravity is controled by the Gyroscope under the Churning Rocks at the center of the planet. The Gyroscope is guarded by Jaguara, an ancient Thundercat sorceress. Mumm-Ra disguises himself as Jaga and puts Jaguara under a spell, making her change the rotation of the Gyroscope to throw the Thundercats clear off the planet. As the Thundercats are floating away, Lion-O calls on the Eye of Thundera to help him, and it breaks Mumm-Ra's spell... but not before Mumm-Ra takes part of the Gyroscope's regulator. Without those controls, the planet will be destroyed within 2 hours...

    Director: N/A

    Writer: Peter Lawrence

  • Return to Thundera (5)
    7.9/10 126 votes

    #21 - Return to Thundera (5)

    Season 4 Episode 5 - Aired 1989-09-08

    After another earthquake caused by Mumm-Ra ruins the new Cats Lair construction site, the Thundercats go to see Jaguara and confront Mumm-Ra. Unfortunately, Mumm-Ra puts up a force field over entrance. Jaga appears to Lion-O and tells him to use the Eye of Thundera to get to Jaguara and the Gyroscope. Lion-O does so and battles Mumm-Ra, who throws him into the bottomless pit underneath the Gyroscope. Lion-O however, manages to throw his grappling hook to the top, which pulls him back up. Lion-O then shines the signal, which goes through the force field. All the Thundercats leap through the signal which takes them through the force field. Together, they fire all their weapons at Mumm-Ra and he is defeated. But before he leaves, he breaks the cord that holds the Gyroscope above the pit and it falls through. Now, New Thundera is literally falling apart. But Lion-O throws the sword in the spot where the Gyroscope used to be and calls upon the Thundercat Ancestors for help. The sword starts

    Director: N/A

    Writer: Peter Lawrence

  • All That Glitters
    7.8/10 164 votes

    #22 - All That Glitters

    Season 1 Episode 17 - Aired 1985-10-01

    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: N/A

    Writer: Bob Haney

  • Spitting Image
    7.8/10 163 votes

    #23 - Spitting Image

    Season 1 Episode 18 - Aired 1985-10-02

    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: N/A

    Writer: Howard Post

  • Feliner (1)
    7.8/10 147 votes

    #24 - Feliner (1)

    Season 1 Episode 29 - Aired 1985-10-31

    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: N/A

    Writer: Steve Perry

  • The Mumm-Ra Berbil
    7.8/10 149 votes

    #25 - The Mumm-Ra Berbil

    Season 1 Episode 47 - Aired 1985-11-26

    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: N/A

    Writer: Jeri Craden