Henry Winkler Arthur "Fonzie" Fonzarelli Actor Marion Ross Marion Cunningham Actor Tom Bosley Howard Cunningham Actor Anson Williams Warren "Potsie" Weber 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 Ted McGinley Roger Phillips Guest Star Michael McManus Sheriff Guest Star Sam Edwards Dr. Abner Guest Star Michele Tobin Allison Guest Star Jerry Paris Director