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 Pat Morita Arnold Guest Star Danny Butch Spike Guest Star Clint Howard Moose Guest Star Susan Lawrence Gigi Guest Star Jerry Paris Director