John Sorrenstein

John Sorrenstein is a character who appeared in the episode My Mom.

Description
Even though Muscle Man resembles a zombie,monster or a disfigured humanoid and has green skin, his brother has pale green/gray skin and resembles a tall, plump, grown man. It is revealed that he's older than Muscle Man because he calls him little 'brother' on the radio. He arrives to teach Mordecai and Rigby a lesson on making fun of their mom. He also appears in, Trucker Hall of Fame where he strikes a pinata but scorpions fall on him.

He was voiced by Steven Blum.

Trivia

 * He is obese and has a muffin top like Muscle Man.
 * Unlike Muscle Man and their father, he looks more like a human being.
 * John is the third family member to appear at the park; the first is Don and the second is Mr. Maellard. The forth and fifth are Low Five Ghost, and Hi Five Ghost's Father.
 * His hair looks like the hair on the picture of Muscle Man's mom, who shows Mordecai and Rigby.
 * He bares a resemblance to a Lolly Poopdeck from The Marvelous Misadventures of Flapjack, which JG Quintel also worked on.
 * His legs are oddly long for his body.
 * In Trucker Hall of Fame, Muscle Man calls him Muscle Bro.
 * It is revealed in Trucker Hall of Fame he was pranked on his birthday when Muscle Dad and Muscle Man put scorpions in his pinata insted of candy.
 * It is most likely that he is Muscle Man's older brother.