Wilykit and Kat accidentally free an ancient monster that was banished to an old shrine centuries ago. The evil monster, Mongor, begins to destroy the planet, and is much stronger than the Thundercats. He captures all the elder Thundercats with his powers. Wilykit and Kat return to the shrine to find a way to destroy him. They report back to Lion-O and tell him that in order to destroy Mongor, he has to fight the monster without looking at it. Lion-O defeats the monster and all is returned to normal.
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