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 Scott Baio Chachi Arcola Guest Star Lynda Goodfriend Lori Beth Allen Guest Star Susan Mullen Cindy Guest Star Julie Brown Gloria Guest Star Shirley Kirks Blossom Guest Star Jerry Paris Director