Henry Winkler Arthur "Fonzie" Fonzarelli Actor Marion Ross Marion Cunningham Actor Tom Bosley Howard Cunningham Actor Anson Williams Warren "Potsie" Weber Actor Crystal Bernard K.C. Cunningham Guest Star Cathy Silvers Jenny Piccalo Guest Star Ted McGinley Roger Phillips Guest Star Linda Purl Ashley Pfister Guest Star Scott Baio Chachi Arcola Guest Star Erin Moran Joanie Cunningham Guest Star Pat Morita Matsuo 'Arnold' Takahashi Guest Star Robert Pierce Bingo Guest Star Derrel Maury Mario Mastorelli Guest Star Winifred Freedman Annette Mastorelli Guest Star Dick Yarmy Holstein Guest Star Jerry Paris Director