Henry Winkler Arthur "Fonzie" Fonzarelli Actor Tom Bosley Howard Cunningham Actor Marion Ross Marion Cunningham Actor Erin Moran Joanie Cunningham Actor Scott Baio Chachi Arcola Guest Star Anson Williams Warren "Potsie" Weber Guest Star Ted McGinley Roger Phillips Guest Star Rita Wilson Barbara McManus Guest Star Janine Turner Debbie Guest Star Shawn Weatherly Sissy Guest Star Robin Klein Lisa Guest Star Jerry Paris Director