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 Al Molinaro Al Delvecchio Guest Star Roz Kelly Pinky Tuscadero Guest Star Michael Pataki Count Mallachi Guest Star Ken Lerner Rocco Guest Star Doris Hess Tina Guest Star Kelly Sanders Lola Guest Star Jerry Paris Director