Journey to the Center of Carl Jimmy creates a Sick Patch to make him and his classmates get sick and stay out of school. But when the Sick Patch dissolves into the kids' skin, Jimmy has to go inside Carl to track down the germ and make a vaccine. Aaughh!! Wilderness!! Hugh takes Jimmy, Sheen, and Carl on a camping trip into the wilderness, allowing no technology whatsoever. So what will save them when a big problem comes along?