Mumm-Ra summons the Driller to destroy the Cats' Lair by drilling a tunnel from the Acid Lake to the Lair's foundations. The Sword of Omens shows Lion-O the source of the danger and Tygra, having analyzed the acid, concludes that the alkaline Sponge Fog can only neutralize it. Using the ThunderTank, the Thundercats cut out a section of the Sponge Fog and take it back to the Lair to wedge it beneath the foundations, in the path of the acid. The journey is dangerous and the Thundercats are forced to fight off Rockmen, a Mechanosect, and a Giant Beetle. When the Thundertank's transmission fails and Lion-O investigates, he is almost crushed by a giant worm. Summoned by the Sword, the Thundercats save him. Mumm-Ra, who has witnessed their entire journey, severs the Bridge of Light and causes the ThunderTank to plunge into the River of Despair, where it turns upside down and loses the precious section of the Sponge Fog. Lion-O retrieves the Tank and the Sponge and the Thundercats pack the Sponge into the Lair's foundations, saving their home and defeating Mumm-Ra.

This episode can be found on

Disc 6

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