Bob's college roommate ('the peeper') visits Chicago and shows he has not lost his school age demeanor. He keeps extending his stay, causing friction between Bob and Emily.

Bob's patients observe tradition by planning a surprise party to honor the fourth year of the group's therapy sessions. When an unseen member, a Mr. Gianelli, threatens to turn the party into a disaster, Bob kicks him out of the group. His decision meets with instant group approval until Mr. Gianelli dies under a ton of zucchini.