Mortimer guest stars in Mickey Mouse Clubhoues

Mortimer Mouse is Mickey Mouse's rival and second arch-enemy in animation, after Pete. Mortimer first appeared in the Mickey short Mickey's Rival and ever since he has been battling Mickey for Minnie's affections in Minnie Rella

Mortimer's most recent appearance is in the CG animated series Mickey Mouse Clubhouse. He has a non-speaking role in Minnie's Birthday.

Mortimer makes his first speaking appearance (which is also his bigger role) in the episode: Super Adventure. He has a supervillain ego named Mega-Mort.