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25 Episodes 1986 - 1987
Episode 1
Mon, Sep 7, 198722 mins
Mumm-Ra sends the Mutants to release former enemies of his, the Lunataks, to help them fight against the recently reinforced Thundercats. But our Thundercats won't be completely unprepared, as Snarf thinks he heard Mumm-Ra's voice at the Mutants' headquarters.

Episode 2
Tue, Sep 8, 198747 mins
The Mutants succeed in releasing the Lunataks, who immediately begin looting Thundrillium and taking slaves from the local villages, leading to their first run-in with the Thundercats.

Episode 3
Wed, Sep 9, 198722 mins
The Thundercats build the Tower of Omens to monitor for new and dangerous enemies. Meanwhile, Ma-Mutt, disguised as a Berbil, spies on the Thundercats.

Episode 4
Thu, Sep 10, 198722 mins
Mumm-Ra's power is restored, and Snarfer makes it to Third-Earth but crashes in the Lunataks territory, leading the Thundercats to rush to find him before they do.

Episode 5
Fri, Sep 11, 198722 mins
In searching for the Lunataks flying fortress Sky Tomb, the Thundercats discover that Mumm-Ra is alive again and more powerful than ever before, leading to an epic battle between him and Lion-O.

Episode 6
Mon, Sep 14, 198723 mins
Mumm-Ra takes the form of Jaga and creates dissent within the ranks of the Thundercats, causing them to fight each other.
Episode 7
Tue, Sep 15, 1987
The Lunatak Alluro uses a powerful talisman on the Thundercats that takes away all their self-confidence, leaving them hopeless and confused.
Episode 8
Wed, Sep 16, 198723 mins
In his latest evil scheme, Mumm-Ra plans on using the legendary Mask of Gorgon, an artifact which turns all to stone, against the Thundercats.
Episode 9
Thu, Sep 17, 198723 mins
After venturing into a remote cave on Hook Mountain in search of Thundrillium, the Lunataks and later the Thundercats fall victim to a bizarre entity with the power to expand upon the negative influences in a person's soul.
Episode 10
Fri, Sep 18, 198723 mins
Mumm-Ra summons the Berserkers and coats their armour in Thundrainium and sends them to assault the Thundercats at the Tower of Omens.

Episode 11
Mon, Sep 21, 198723 mins
Ravage Island is an island on Third-Earth with a powerful beacon on it that can control minds. Mumm-Ra seeks to use the beacon to make the Thundercats his slaves.
Episode 12
Tue, Sep 22, 198723 mins
Thanks to an unfortunate mishap with a time capsule, Lion-O rapidly grows younger and younger. His fellow Thundercats must reverse the process before he ceases to exist.

Episode 13
Wed, Sep 23, 198723 mins
Vultureman builds a powerful sonic gun with a sound stone he steals from the Lunataks territory of Darkside.
Episode 14
Thu, Sep 24, 198723 mins
The day of the eclipse arrives and any spell Mumm-Ra casts will last until the next eclipse. He casts a spell of decay on the Cats Lair, causing it to fall apart.
Episode 15
Fri, Sep 25, 198723 mins
Chilla freezes Snarfer's spaceship as he heads back to the Tower of Omens. When Mandora gets involved, Chilla freezes her and becomes a fugitive from the law.

Episode 16
Mon, Sep 28, 198723 mins
Luna discovers that her grandmother's magic belt is in the possession of Mumm-Rana and heads straight for the Pyramid of Light to claim the artifact and greatly increase her own power.
Episode 17
Tue, Sep 29, 198723 mins
Luna tricks Hachiman and steals his sword, the Thunder-Cutter, and gives it the Lunataks new samurai robot, the Automaton.
Episode 18
Wed, Sep 30, 198723 mins
Feeling neglected, Wilykat and Wilykat decide to run away to teach the rest of the Thundercats a lesson. However, thanks to Mumm-Ra, not all goes according to plan.

Episode 19
Thu, Oct 1, 198723 mins
When all of the Thundercats except Lion-O are gone, Mumm-Ra switches Snarf with Ma-Mutt, who gives Lion-O poisoned candy fruit.
Episode 20
Fri, Oct 2, 198723 mins
Vultureman builds a devastating device called the Thundranium projector which Wilykat and Wilykit manage to ruin. In return, he damages their space boards, putting them in major peril.

Episode 21
Mon, Sep 8, 198622 mins
A nightmare torments Lion-O. He believes that he was saved from his erupting planet as a youngster at the sacrifice of three other Thunderians. Jaga informs the now grown Lion-O that his nightmare is false.

Episode 22
Tue, Sep 9, 198622 mins
Lion-O raids the Berserker's ship, but the 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. Weakened by the Thundrainium, the thunderians are trapped on the mountain.

Episode 23
Wed, Sep 10, 198623 mins
On Hook Mountain, Lion-O prepares to battle Monikan in the Fistpounder, when they are caught in an avalanche.

Episode 24
Thu, Sep 11, 198622 mins
The sun drains the powers of Mumm-Ra's mummy bandages and Lion-O escapes from their grasp.

Episode 25
Fri, Sep 12, 198623 mins
Weakened by the Thunderians pits below, Lion-O hangs from the bridge at Fire Rock Mountain. Hachiman finally realizes that Mumm-Ra tricked him into believing that Lion-O had turned evil.
