Henry Winkler - Arthur 'Fonzie' Fonzarelli :(44 episodes, 1974 - 1984)
Marion Ross - Marion Cunningham :(41 episodes, 1974 - 1984)
Tom Bosley - Howard Cunningham :(40 episodes, 1974 - 1984)
Erin Moran - Joanie Cunningham :(39 episodes, 1974 - 1984)
Ron Howard - Richard 'Richie' Cunningham :(38 episodes, 1974 - 1984)
Don Most - Ralph Malph :(35 episodes, 1974 - 1983)
Anson Williams - Warren 'Potsie' Weber :(34 episodes, 1974 - 1984)
''Richie Cunningham and his friend Potsie face life at Jefferson High in Milwaukee Wisconsin in the 1950s. Originally fifth-billed Fonzie moved up steadily, finally into first billing in 1980, as the thumbs-up, "Heyyy!" biker increased his own and show's popularity. Lots of changes over time as kids come and go.''
