Hurter Monkey: Billy and Mandy trade Grim in for a monkey butler. In order to get his life back, Grim has to return and clean up the mess... with a vengeance. | Goodbling and the Hip-Hop-Opotamus: A misplaced scythe blast turns boring old Principal Goodvibes into an old school rapper determined to rule the school with a bling fist, a beat-boxing hippo and some really fly shoes.