Mischievous Mork from Ork takes a break from earth year 1979, where he has been assigned to observe humanity, to visit 1950's Richie Cunningham, get a dose of humdrum and learn about relationships.

Richie's band hunts for a piano player, Howard and Marion practice their bridge signals, and Fonzi plans a sting on the shyster who duped Chachi into selling a miracle wax that soon destroys what it shines.