The Fonz asks Richie to keep a close eye on his attractive girlfriend, Denise, while Fonz attends a demolition derby in another city. Richie is more than happy to do this, but the young lady in question is far from impressed when she learns what Fonzie has asked Richie to do. Determined to test Richie's resolve, she sets out to make out with him at Inspiration Point,and that would all be fine until Richie comes down with a nasty case of mono, obviously caught from Fonzie's girl.
Sensibly, Richie is far more worried about how the Fonz will react when he finds out than how sick he might be with mono!
A pretty ordinary episode and very predictable, but Ron Howard does a very good job as the terror-stricken Richie who has to face up to Fonzie.