To save the universe, and their friendship, Mordecai and Rigby must defeat an evil volleyball coach.After a future, dying Rigby comes to warn the gang about the future, they must time travel back in time to when Mordecai and Rigby were in high school to stop a evil, crazy volleyball coach from destroying time. Will it work? Can Rigby tell the truth even if it will cost him and Mordecai their friendship?