King Leonidas is the main antagonist in the movie Bedknobs and Broomsticks. He is the leader of the animals on his island. Like the other animals of the isle, he has the power of speech (with a Boston/Irish accent) and other human attributes due to the spell of the wizard Astoroth. The King wears the Star of Astoroth, a golden medallion inscribed with the words to substitutiary locomotion spell. He looks somewhat like Prince John, especially since the two also share a short temper, but more like Shere Khan due to their big chins and identicle noses.
Initially friendly, the King is delighted when he is told that Mr. Browne has experience as a football captain. He makes Mr. Browne the referee for the royal football match. Mr. Browne, after being trampeled during the match, performs what he calls a "gypsy switch". Upon discovering that his precious medallion has been exchanged for the referee's whistle, the King flies into a rage and orders the entire population of Naboombu to pursue Ms. Price, Mr. Browne and the children.
In a desperate attempt to escape, Ms. Price uses a spell, and finally succeeds in turning the fearsome lion into a long-tailed rabbit. His final fate remains unknown afterwards.