Al Delvecchio promises to provide the guest entertainment for the local Leopard Lodge's musical, the 15th annual "Poobah Doodah"; but can he really deliver his fifth cousin, once removed...teen heart-throb Frankie Avalon?

Howard and Chachi go above and beyond to try to win a dinner with the Lone Ranger for Fonzie's birthday while the Fonz begins to wonder if he should start thinking about settling down with just one girl.