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