Jeffrey The Jellyfish has only appeared in the episode, I'm Your Biggest Fanatic. Patrick chases him to touch him. At the end of the episode, Patrick had him tied up in a wagon.
- The security guard who kept telling Patrick not to touch, probably didn't catch Patrick at the end of the episode, since SpongeBob and Patrick were leaving.
- Jeffrey was either a jellyfish that was not regular and was sentient, or he is just a fish in a disguise. If he was a jellyfish, it would be impossible for him to walk on legs.