Surgery fixes the Fonz's injured knee but the Cunningham's coddling and his fear that pain will make him appear "uncool" keeps him lying on the couch, until Richie resorts to extreme measures to get Fearless Fonzarelli walking again.

Richie is continually harassed by local hoodlums Frankie and Rocko. When they humiliate him in front of his girlfriend at Arnold's, he turns to Fonzie for advice in turning the tables on his foes and he ends up enrolling in a jujitsu class.