Mitch "Muscle Man" Sorrenstein is one of the main characters of Regular Show. He is one of the groundskeepers of the Park. He is a green, strong, and an obese human (But, was once a very stunning man), who is often seen with his best friend, Hi Five Ghost. Muscle Man made his first debut as a cameo character in the Pilot, and then made an official appearance in Just Set Up the Chairs. Muscle Man is voiced by Sam Marin. His girlfriend is Starla. Weird enough Starla is green too. She is also obese. Muscle Man is friends with the plot characters Mordecai and Rigby, but calls them losers. They are his wingmen.