Mitch "Muscle Man" Sorrenstein is a green male humanoid from the animated Cartoon Network series Regular Show. He is one of the main characters. He is well known for telling "MY MOM" jokes to everyone and is often seen with his best friend, Hi Five Ghost. He often says "Oh no Bro!" when things go wrong. He made his first appearance as a cameo in the animated pilot, and then made his official appearance in the Season 1 episode Just Set Up the Chairs. He is voiced by Sam Marin.