Too bad TV networks just can't leave good enough alone.
I'll nominate a couple:
The Roepers. A spin-off of Three's Company. So bad you probably don't even remember it. The gist: Stanley and Helen move into a new apartment complex and deal with another batch of (what else?) wacky neighbors.
Joanie Loves Chachi. Happy Days was great. Joanie and Chachi...weren't. Interesting side note: The show's premier episode actually hit No. 1 on the charts in Korea, where "chachi" means "penis."