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 Gavan O'Herlihy Chuck Cunningham Guest Star Diana Canova Phyllis Denton Guest Star Beatrice Cohen Marsha Simms Guest Star Gracia Lee Hazel Guest Star Mike Monahan Harry Mel Guest Star Karen Duitsman Susan Denton Guest Star Peter Baldwin Director