Frogman arrived on Thundera an eternity ago. He left his homeworld because it was drying up. He tried to dominate Thundera by flooding it, but Jaga imprisoned him in an underground lake. Unfortunatly, Wilykit & Kat release him while drilling a well.
Pretending to be their friend and ally, Frog Man quickly turns on them and tries to sink the new Cat's Lair. In the end, Lion-O is able to defeat him and trap him in his original prison.