Oh boy, signed my Mermaid Man and Barnacle Boy, now I shall be the envy of the Superhero Fan Club!
— Incidental 158, "Ditchin'"

Incidental 158 is a light brown fish who first appears in the episode "Prehibernation Week."



He is a light brown fish, with a light yellow dorsal fin. He has black eyes and is usually seen wearing a red T-shirt and a white and blue propeller cap.

Role in series

"Squirrel Jokes"

He is in a super market then when he walks up to Sandy and then his mother says, "Billy, don't talk to a squirrel. You'll catch its stupid."

"Skill Crane "

He is in the Krusty Krab to use the Skill Crane to win but Squidward mocks him, which prompts Billy to kick Squidward's legs out of anger.

"Who R Zoo?"

He tries to enter the Bubble Zoo but SpongeBob stops him and says he is required to smile to enter. He literally then turns his frown upside down and allow him to go in.


Incidental 158's model


  • In some episodes, he can be seen in winter clothes.
  • He is labeled "kid w/ beanie" in storyboards.[1][2]
  • In the game Drawn to Life: SpongeBob SquarePants Edition, Billy appears with about two color schemes. In some levels, he has his normal color scheme. In others, he is light green with a yellow shirt and a pink beanie.


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