Goodsport said:
[*]Happy Days ---> Laverne & Shirley; Joanie Loves Chachi; Mork & Mindy
There's another series in here, but I can't think of the name of it. I remember seeing it on a special about Gary Marshall (or maybe it was Penny Marshall). It had both Laverne and Chachi (when he was still just a little kid) on it. Actually, now that I think about it, it may have been the 1st appearance of Chachi.
Here's a few more:
He-Man ---> She-Ra. Plus there are the 2 revivals of He-Man, but they don't really count.
The Muppet Show --> Muppets Tonight; Muppet Babies
Hercules ---> Xena; Young Hercules
Lone Ranger ---> Green Hornet (he's LR's great-nephew or something)
And wasn't there a very short-lived lawyer show starring that bald defense attorney that spun off from N.Y.P.D. Blue? Or was that a shared universe thing? I didn't watch the lawyer show, so I have no idea.
I can think of a bunch that are more "shared universe" than spin-offs (like the Space Ghost, his later series that feature Kid Comet, Moleculad, and, um, the girl, whatshername, and Herculoids).
Oh wait! Space Ghost ---> Space Ghost Coast-To-Coast (different enough from the original to count as a spin-off); The Brak Show
And whatever show Birdman was on ---> Harvey Birdman, Attorney At Law
I know they tried to spin off Jonah Hex and Creeper from Batman Adventures, but they never got off the ground.
And what was that show that Nell Carter did back in the '80's? Didn't that spin-off from something like Diff'rent Strokes?