Mitchell "Mitch" Sorenstein, commonly known as Muscle Man, is one of the main characters of Regular Show. He is one of the groundskeepers at the Park. He is a green, strong and obese monster and/or disfigured humanoid, who is often seen with his best friend, High Five Ghost. Muscle Man made his first debut as a cameo character in the Pilot, and then made an official appearance in The Power.