Robinson Peepers arrives at Jefferson Junior High School to find that he will have to wait a month before construction is finished on the new addition in which he was to teach. He is assigned to work with the current science teacher, Mr. Wadd, but Wadd resents the new addition to the faculty, and forces Peepers to sit on the sidelines. At lunch, Peepers' cafeteria tray inadvertently snags Wadd's toupee, revealing his baldness. When Wadd leaves in shame, Mr. Peepers is assigned to take his place.

Mr. Peepers finds himself short of cash and a decent lunch when his first paycheck fails to arrive on time. The home economics teachers, worried about his diet, invite him over to taste their students' cooking projects, and sample some halibut they are about to prepare. The problems begin when Mr. Peepers loses his tie clip inside of the fish. As Mr. Peepers grapples with the halibut, Mr. Feebles attempts to fix the ventilating machine, which proceeds to suck up Mr. Peepers' paycheck, the halibut, and finally, Peepers himself.