The movie will shift its focus on Erik Stifler, the cousin of Matt and Steve, a youngster who is nothing like his wild relations. Peer pressure starts to turn him to live up to the legacy of the other Stiflers when he attends the Naked Mile, a naked run across the college campus. Things get worse when he finds that his cousin Dwight is the life of the party down at the campus.

Morris "Mud" Himmel has a problem. His parents desperately want to send him away to summer camp. He hates going to summer camp, and would do anything to get out of it. Talking to his friends, he realises that they are all facing the same sentence: a boring summer camp. Together with his friends, he hatches a plan to trick all the parents into sending them to a camp of his own design, which would actually be a parent-free paradise. Blackmailing former drama teacher Dennis Van Welker into helping, they must convince the parents that the camp is genuine, and that they aren't allowed to visit...