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.
ThunderCats (Season 2)

ThunderCats Ho! (1) (Episode 1) 8.0
Air date: 1986-09-08
Runtime: 22 min
Overview: 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.

ThunderCats Ho! (2) (Episode 2) 8.0
Air date: 1986-09-09
Runtime: 22 min
Overview: 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.

ThunderCats Ho! (3) (Episode 3) 8.0
Air date: 1986-09-10
Runtime: 22 min
Overview: Lion-O loses the Sword of Omens in an avalanche. Panthro battles the Fist-Pounder with the ThunderTank. The Mutants arrive at Fire Rock Mountain to take control of the prisoners.

ThunderCats Ho! (4) (Episode 4) 6.0
Writer: Leonard Starr
Air date: 1986-09-11
Runtime: 22 min
Overview: The Thunderians attempt to escape their prison. Lion-O arrives at Fire Rock Mountain and is confronted by Hachiman who believes Lion-O is causing the suffering of his ancestor.

ThunderCats Ho! (5) (Episode 5) 6.0
Writer: Leonard Starr
Air date: 1986-09-12
Runtime: 22 min
Overview: Lion-O and Hachiman are reconciled and the ThunderCats close in on rescuing the Thunderians from Fire Rock Mountain. But they'll need supernatural help if they are to pass through the Thundranium gases to reach them.

Mumm-Ra Lives (1) (Episode 6) 6.0
Writer: Leonard Starr
Air date: 1987-09-07
Runtime: 22 min
Overview: Mumm-Ra is weak and faces the threat of three new ThunderCats; he sends the Mutants to release his old enemies, the Lunatacs, imprisoned in Dark Side[29] in order to bolster the forces of evil. The ThunderCats' celebration of their victory over Mumm-Ra and the welcoming of three new ThunderCats is cut short when Snarf overhears plans at Castle Plun-darr after he chased Ma-Mutt there from the Berbil village.

Mumm-Ra Lives (2) (Episode 7) 6.0
Writer: Leonard Starr
Air date: 1987-09-08
Runtime: 22 min
Overview: The Mutants succeed in releasing the Lunatacs. The ThunderCats discover their Thundrylium mine is being looted and people are being kidnapped from the villages. Lion-O & the ThunderKittens have their first run-in with a Lunatac and Bengali's skills as a blacksmith come in handy.

Mumm-Ra Lives (3) (Episode 8) 6.0
Writer: Leonard Starr
Air date: 1987-09-09
Runtime: 22 min
Overview: The ThunderCats build the Tower of Omens to monitor for Sky Tomb, which will be run by the new ThunderCats. Disguised as a Berbil, Ma-Mutt spies on the ThunderCats' plans and the Lunatacs are sent to destroy the Tower. Snarfer contacts Snarf to tell his uncle that he's returning to Third Earth.

Mumm-Ra Lives (4) (Episode 9) 6.0
Writer: Leonard Starr
Air date: 1987-09-10
Runtime: 22 min
Overview: Mumm-Ra's power is restored. Snarfer makes it to Third Earth, but crashes in Dark Side. The ThunderCats rush to his aid before the Lunatacs can get a hold of him.

Mumm-Ra Lives (5) (Episode 10) 6.0
Writer: Leonard Starr
Air date: 1987-09-11
Runtime: 22 min
Overview: The ThunderCats look for Sky Tomb to free the slaves imprisoned inside it. Bengali must learn the importance of teamwork as Lion-O leaves him with guard duty. Lynx-O and Cheetara run reconnaissance to find out if Mumm-Ra is truly back or not.

Catfight (Episode 11) 6.0
Writer: Chris Trengove
Air date: 1987-09-14
Runtime: 22 min
Overview: By disguising himself as Jaga, Mumm-Ra tricks Lion-O into believing the new ThunderCats are traitors so that they will fight amongst themselves.

Psych Out (Episode 12) 6.0
Writer: Sandy Fries
Air date: 1987-09-15
Runtime: 22 min
Overview: Mumm-Ra tells Alluro where to find a talisman that boosts the self-confidence of the one who possesses it so that they become nearly invincible. Snarf learns that true courage comes from within.

The Mask of Gorgon (Episode 13) 6.0
Writer: Romeo Muller
Air date: 1987-09-16
Runtime: 22 min
Overview: Ma-Mutt digs up an ancient book, which leads Mumm-Ra to search for the ancient evil of the mask of Gorgon

The Mad Bubbler (Episode 14) 6.0
Writer: Kimberly Morris
Air date: 1987-09-17
Runtime: 22 min
Overview: The Lunatacs look for Thundrylium in a cave on Hook Mountain, only to be driven mad by a strange creature that turns them against each other.

Together We Stand (Episode 15) 6.0
Writer: Herb Engelhardt
Air date: 1987-09-18
Runtime: 22 min
Overview: Mumm-Ra coats the Bezerker's weapons and armor with Thundranium. Wilykit and Wilykat find that guarding Cats' Lair is not always a breeze.

Ravage Island (Episode 16) 6.0
Writer: Mike Moore
Air date: 1987-09-21
Runtime: 22 min
Overview: Mumm-Ra activates a mesmerizing beacon on Ravage Island, which draws the ThunderCats to it and takes hold of their minds.

Time Switch (Episode 17) 6.0
Writer: Sandy Fries
Air date: 1987-09-22
Runtime: 22 min
Overview: While taking care of a dangerous Suspension Capsule, dug up near Cats' Lair, Lion-O is exposed to harmful gasses inside that cause him grow younger. If the ThunderCats do not find a solution in time, he will rapidly become younger until non-existent.

The Sound Stones (Episode 18) 6.0
Writer: J. Larry Carroll
Air date: 1987-09-23
Runtime: 22 min
Overview: Vultureman builds a sonic gun from a sound stone he stole in Dark Side as the Lunatacs join with him to attack the Tower of Omens.

Day of the Eclipse (Episode 19) 6.0
Writer: Kimberly Morris
Air date: 1987-09-24
Runtime: 22 min
Overview: The day of the centennial total eclipse has arrived, and any spell Mumm-Ra casts will last until the next eclipse. He declares a "Day of Decay" on the Cats' Lair, causing it to fall apart.

Sideswipe (Episode 20) 6.0
Writer: William Overgard
Air date: 1987-09-25
Runtime: 22 min
Overview: Chilla freezes Snarfer's spaceship as he heads back to the Tower of Omens with Berbil Mexican takeout. When Mandora gets involved, Chilla freezes her and becomes a fugitive from the law as Mandora sets her sights on bringing her in.

Mumm-Rana's Belt (Episode 21) 6.0
Writer: James Rose
Air date: 1987-09-28
Runtime: 22 min
Overview: 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.

Hachiman's Honor (Episode 22) 6.0
Writer: J. Larry Carroll
Air date: 1987-09-29
Runtime: 22 min
Overview: 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.

Runaways (Episode 23) 6.0
Writer: Bill Ratter
Air date: 1987-09-30
Runtime: 22 min
Overview: 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.

Hair of the Dog (Episode 24) 6.0
Writer: Chris Trengove
Air date: 1987-10-01
Runtime: 22 min
Overview: 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.

Vultureman's Revenge (Episode 25) 6.0
Writer: Herb Engelhardt
Air date: 1987-10-02
Runtime: 22 min
Overview: 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.

Seasons

Episodes 65

Episodes 25

Episodes 20

Episodes 20

Episodes 5