Numerous successful scripted television shows made their way to Saturday mornings in the mid-70s, like I Dream of Jeannie, Gilligan's Island, and Star Trek.  The Partridge Family got the same treatment in 1974, but with a catch--it's set over 200 years in the future.  Also, some key components in the Partridge Family universe were missing.  If you see the show image, it looks awfully similar to a venerable Hanna-Barbera series, and for good reason.