 The class takes a field trip to the planetarium, but Cartman sneaks off to try out for a Cheesy Poofs commercial. Though the kids are bored at first, they come back from the trip eager to go again. The reason for this sudden change is explained when Mr. Mackey mind-melds with a frightened little boy who stowed away in the school bus. As the planetarium s secret is being revealed, Cartman is overjoyed to learn that he has been selected to be a Cheesy Poof.