Henry Winkler Arthur "Fonzie" Fonzarelli Actor Tom Bosley Howard Cunningham Actor Marion Ross Marion Cunningham Actor Don Most Ralph Malph Actor Anson Williams Warren "Potsie" Weber Actor Ron Howard Richie Cunningham Actor Erin Moran Joanie Cunningham Actor Scott Baio Chachi Arcola Guest Star Lynda Goodfriend Lori Beth Allen Guest Star Ted McGinley Roger Phillips Guest Star Bo Sharon Richie Cunningham Jr. Guest Star Walter Von Dean McGrath Guest Star Jerry Paris Director