Willa is practicing her long-bow skills when a warning device alerts her to a Mutant attack. Willa and her sister Nayda fight back until a Mutant laser beam sets their roof afire. Jackalman kidnaps Willa and takes her to Castle Plun-Darr. The Thundercats rush to rescue her. Tygra and Nayda render themselves invisible and enter the Castle. Tygra pretends to be a ghost and frightens Jackalman into releasing Willa. Tygra and Willa fight Slithe and Monkian and escape to the nearby forest, where they try unsuccessfully to become visible again. They realize only the Eye of ThunDERa can restore their visibility. They set out to find Lion-O and are attacked by Vultureman. They subdue him and defeat Monkian, Jackalman, and Slithe. Lion-O arrives on the hijacked Flying Machine and holds the Mutants off until he can summon the other Thundercats. The Mutants are forced to retreat to Castle Plun-Darr. The Eye of ThunDERa restores Tygra and Willa to their normal states.

This episode can be found on

Disc 10

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