Fonzie asks Richie to watch after his girl, Denise, while he's out of town at a demolition derby. Denise, upon hearing what Fonzie's asked Richie to do, decides to test Richie's trustworthiness. Richie succumbs to temptation and makes out with Denise at Inspiriation Point, but he later finds out that she has mononucleosis.
Elenco: Marion Ross , Tom Bosley , Anson Williams , Henry Winkler , Erin Moran , Ron Howard , Al Molinaro , Don Most , Scott Baio , Ted McGinley , Cathy Silvers .