Jeffrey the Jellyfish is a fish in a jellyfish mascot suit. He first appears in the episode "I'm Your Biggest Fanatic."


Jeffrey wears a large mascot suit of a pink jellyfish. Instead of normal stingers, he has legs and knees, as shown when they are bent over while Patrick carries him away in a little wagon. His expression seems to change depending on the situation.


"I'm Your Biggest Fanatic"

Patrick chases him to touch him. At the end of the episode, Patrick has him tied up in a wagon.

"Tutor Sauce"

He appears in the background at the arcade that SpongeBob and Mr. Krabs go to to teach SpongeBob how to drive.