The costume is designed to be a giant Krabby Patty wearing goggles and a suit, and has lavender hands and legs resembling an octopus.
Role in episode
The Killer Krabby Patty comes to save SpongeBob from the other restaurant owners who tried to kidnap him, beating up all of them except Mister Weiner, who walks off and then gets hit by an incoming bus.
He brings SpongeBob back to the Krusty Krab, which is ruined due to how Mr. Krabs has been managing it, and then reveals to SpongeBob that he is Squidward. He says that although he dislikes SpongeBob, he dislikes the smell of burning Krabby Patties more.
The Killer Krabby Patty might be a reference to McDonaldland's Mayor McCheese.