Mongor

Die beiden kleinen Thunder Cats Minikat und Minikit befreien versehentlich Mongor, den Herrn aller Furcht. Der beginnt sofort das ganze Land zu verwüsten. Er setzt Tigro, Geparda und auch Panthro außer Gefecht.

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.

Durante una exploración, los pequeños ThunderCats se cruzan con un antiguo templo y su curiosidad hace que liberen a un demonio cuyo poder proviene del miedo. Depende de los ThunderCats el poder encontrar una forma de superar sus miedos y vencer a Mongor.