The Banana Planet is a gigantic banana floating in space. After receiving an S.O.S. from the planet, the Aqua Teens visit it and find a race of ignorant, purple monkeys who immediately begin flinging purple feces and semen at them. They then 'trap' them in the bananasium and explain to them that if the dome, a giant statue depicting a monkeys ass, excretes two turds, they will be put to death; if, however, one turd emerges, they will be made kings of the planet, a title that the current king is trying to hock on them due to the food shortage.
Despite literally living on a giant banana, the monkeys never attempt to eat any of it. They also think that planting a ham will result in a ham tree.