Henry Winkler Arthur "Fonzie" Fonzarelli Actor Tom Bosley Howard Cunningham Actor Marion Ross Marion Cunningham Actor Anson Williams Warren "Potsie" Weber Actor Cathy Silvers Jenny Piccalo Guest Star Crystal Bernard K.C. Cunningham Guest Star Linda Purl Ashley Pfister Guest Star Heather O'Rourke Heather Pfister Guest Star Richard Paul Dick Cunningham Guest Star Sue Ane Langdon Belle Guest Star Pat Morita Matsuo 'Arnold' Takahashi Guest Star Jerry Paris Director