The Grundle King is the leader of the Grundles. He and the Grundles currently live in Dream Castle. He is voiced by Danny Devito.


He has grey skin and wears a dark green hat with a pointy, green brim and a gold bell on the tip, a red vest, a gold necklace with a blue gem in the middle, and a cute yellow bow on his tail. Unlike the other four grundles who have shoes on their feet, he goes barefoot.