Henry Winkler Arthur "Fonzie" Fonzarelli Actor Tom Bosley Howard Cunningham Actor Marion Ross Marion Cunningham Actor Erin Moran Joanie Cunningham Actor Don Most Ralph Malph Actor Scott Baio Chachi Arcola Guest Star Ron Howard Richie Cunningham Actor Anson Williams Warren "Potsie" Weber Guest Star Ted McGinley Roger Phillips Guest Star Kevin Rodney Sullivan Tommy Guest Star Cathy Silvers Jenny Piccalo Guest Star Harris Kal Bobby Guest Star Danny Ponce Danny Guest Star Nancy Steen Mrs. Friedman Guest Star Lynda Goodfriend Lori Beth Allen Guest Star Pamela Dunlap Doris Charles Guest Star Meridith Baer Judy Guest Star Steven Baio Joey Guest Star Tom Silardi Tony Guest Star Bo Sharon Richie Cunningham Jr. Guest Star Jerry Paris Director