Jack M. Crazyfish is a fish who is the main antagonist of the episode "Blackened Sponge." He is originally believed to be a fish in SpongeBob's dreams, but he is actually real and lives in Bikini Bottom.
Jack is a lavender male fish with a very big body. He wears a brown suit and a yellow shirt underneath. He has a big mustache and a small green top hat on his head. On the side of his head are three magenta spots.
Role in series
SpongeBob gets a black eye from trying to take the lid off his toothpaste, but he punches himself in the eyeball and makes up a story that he got the black eye from fighting Jack M. Crazyfish. Jack then comes to the Krusty Krab because he heard that SpongeBob makes great Krabby Patties, and he is hungry for one.