Incidental M1 is a character who appears in the episodes "Your Shoe's Untied," "Mermaid Pants," "Krusty Katering," and "SpongeBob's Big Birthday Blowout."
She is a long, brown eel with light brown hair and has two flippers by her face. Her eyes are white with black pupils. In "Krusty Katering," she is light green and wears a black button-up dress shirt.
Role in series
"Your Shoe's Untied"
While she is eating at the Krusty Krab, SpongeBob runs up to her and asks if she can help him tie his shoes. She says she cannot since she is an eel and does not wear shoes.
She appears eating at the Krusty Krab while SpongeBob and Patrick are singing The Adventures of Mermaid Man & Barnacle Boy Theme Song. She is redesigned, having green fins and having arms.
She plays a clarinet in the band that performs for the party. Squidward steals her spot in an attempt to join the band, but he chases the other members away.
"SpongeBob's Big Birthday Blowout"
She appears as one of the guests at SpongeBob's party.