After Muscle Man's father dies, Benson asks Mordecai and Rigby to help him get to the Trucker Hall of Fame to spread Muscle Dad's trucker hat ashes.

The group helps Muscle Man and Starla on their wedding day. Still, it's Mordecai, whose relationship is in danger when Margaret gets invited, and an awkward speech leads to a final falling-out between Mordecai and CJ.