Happy Days was one of the most successful sitcoms of the 20th century — the ’50s-set family comedy ran for 11 seasons, yielded seven spin-offs, jumpstarted the careers of Robin Williams and Henry ...

We may receive a commission on purchases made from links. Originally aired beginning in 1974 -- just one year after "American Graffiti" put George Lucas on the map and made the 1950s cool again -- ...