King Snorky

King Snorky was an evil dolphin Lisa released back into the wild.

History
Upon being released from Marine World, Snorky took control and started killing humans. He was revealed to be able to speak English and then led the dolphin army to kicking all Springfieldians off the land into the sea.

He was also an enemy of the Simpsons who had to fight off his army and then knock him into an aquarium filled with Electric Eels to kill him.