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If you were looking for the article about the 21st known incidental, then see Incidental 21.
Unknown incidental 21 is an unknown incidental character who appears in the episode "MuscleBob BuffPants" and the book Comic Number 4.
Description
He is a basic red colored fish with tan lips and orange fins who wears army green shorts.
Role in series
Unknown incidental 21 has appeared in only one episode so far, as well as a book that was based on the one episode that he appeared in.
Roles
"MuscleBob BuffPants"
He is one of the many audience members of the Anchor Toss who cheer for SpongeBob and later Sandy after he loses.
Roles in books
Comic Number 4
He makes his exact same roles from "MuscleBob BuffPants" in the "MuscleBob BuffPants" portion of the book.
Gallery
Episode images
