Volume 6, Root Beer Guy / Apple Wedding

S5, E222: Root Beer Guy: Root Beer Guy works a boring job during the day and tries to write mystery stories at night. But his life is about to change when he witnesses Finn and Jake kidnapping Princess Bubblegum! There's only one problem: no one believes Root Beer Guy / Apple Wedding: You are cordially invited to the Wedding of the Year: Tree Trunks and Mr. Pig are getting married!