Ron Howard Richie Cunningham Actor Henry Winkler Arthur "Fonzie" Fonzarelli Actor Tom Bosley Howard Cunningham Actor Marion Ross Marion Cunningham Actor Anson Williams Warren "Potsie" Weber Actor Don Most Ralph Malph Actor Erin Moran Joanie Cunningham Actor Al Molinaro Al Delvecchio Guest Star Scott Baio Al Delvecchio Guest Star Lynda Goodfriend Lori Beth Allen Guest Star Ed Peck Police Officer Kirk Guest Star Sarah Rush Fern Guest Star Pat Crowley Susan Patterson Guest Star Taaffe O'Connell Carol Guest Star Gail Edwards Loretta Guest Star Wendy Hoffman Wendy Guest Star Le Tari Workman Guest Star Britton Payne Polly Guest Star Sparky Marcus Billy Guest Star F. William Parker Vernon Guest Star Jerry Paris Director