The Yellow Avenger is the alter-ego that SpongeBob takes on in the video game of the same name.
He looks exactly like SpongeBob, except he wears Mermaid Man's outfit. He is the main playable character in The Yellow Avenger.
Role in video game
SpongeBob acquires Mermaid Man's powers when he wears his belt. Unfortunately, SpongeBob puts the Dirty Bubble into a washing machine, which causes him to split into countless Dirty Bubbles. SpongeBob has to stop villains such as Man Ray, Sinister Slug, Jumbo Shrimp, Atomic Flounder, and the Dirty Bubble, using Mermaid Man's powers to save Bikini Bottom.
The Dirty Bubble returns to put the end of the Yellow Avenger with the machine the Jumbo Shrimp used in the third act and plans to hit SpongeBob with more little Dirty Bubbles.