He is a light brown anchovy with a spiky dorsal fin on the top of his head. He wears a green sweater, brown pants, and dark brown shoes.
Role in episode
He tells Frankie "Merry Christmas" in a sarcastic way while under the effects of the Jerktonium. Frankie then throws a snowball right into Johnny's face. He is later seen shocked when Santa Claus tells all the Bikini Bottomites that Plankton is the only one who gets a Christmas present this year.