Babysitter Fonzie makes a grave mistake when he listens to championship boxing on the radio during little Heather's tea-party; Joanie has more on her mind than Marion's mothering when she and Chachi head to the comfort of the Cunninghams after she catches the Canadian flu while on tour with the band.

Jenny Piccalo's party plans are jeopardized after she dumps mild-mannered Don the dentist's son to start dating hot Olympic swimmer Eric who confides to K.C. that he doesn't want to get serious with anyone...and especially not Jenny!