Ron Howard turned 20 during the show's first season but still had that baby face and aw-shucks demeanor. His aspirations led him to leave "Happy Days" in 1980.
Howard became a Hollywood hit-maker and A-list director, winning Best Picture and Best Director Oscars. He narrates the adventures of the Bluth family in "Arrested Development."
Though his breakout work on Arthur "The Fonz" Fonzarelli was a big enough deal for studios to try Henry Winkler out as a full-fledged movie star, it didn't take.
Winkler segued to being a character actor, a career that paid off with memorable performances in "Scream," "The Waterboy," "Arrested Development," and "Parks and Recreation."
As acting coach Gene Cousineau on Bill Hader's dark HBO comedy "Barry," Winkler earned a long-deserved Primetime Emmy. He turned 78 last October, and he's never been more exciting.
Marion Ross played one of TV's greatest moms, Marion Cunningham. Mrs. C. was eccentric, a little loopy, but unconditionally loving, and gave expert counsel to Richie.
Ross remained a familiar face and voice on TV shows like Brooklyn Bridge, Gilmore Girls, SpongeBob SquarePants, Family Guy, and King of the Hill. She is currently 95 and retired.
As Potsie Weber, Richie's endearingly dim best friend, Anson Williams, turned what could've been a one-note punchline of a character into a loveable goofball.
He helmed episodes of some of the biggest TV shows, including "L.A. Law," "Beverly Hills 90210," "Melrose Place," "Star Trek: Voyager," and "Lizzie McGuire."
Williams unsuccessfully ran for mayor of Ojai, California, in 2022 and married for the first time at the age of 73 in 2023. "Happy Days" co-star Don Most was his best man.
Don Most was so effectively irritating as the obnoxious practical joker Ralph Malph that he couldn't break free of his wiseass caricature while continuing acting.
Most took a shot at pop music stardom in 1976 with a self-titled LP that failed to chart. Eventually, he formed a swing band and now tours across the country.