Encyclopedia SpongeBobia
Encyclopedia SpongeBobia
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This is the page about Jack M. Crazyfish. For other uses, see Jack (disambiguation).

Jack M. Crazyfish[1] 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

"Blackened Sponge"

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.

"20,000 Patties Under the Sea"

He makes a cameo throwing rocks at Plankton.


  • His voice is different in his first appearance from his second appearance.
  • Jack M. Crazyfish's existence is first hinted by Sandy when she reacts to his name in shock, which implies that she may have met him at some point in the show.


  1. ^ "Blackened Sponge." SpongeBob SquarePants. Nickelodeon. DATE. Television.