Which TV spin-offs hit the target for you?

Watched Torchwood: Children of Earth on dvd last week. [don’t worry, this is a spoiler free post].
Wow!   

Sure, there were a few plot holes, but nothing that put me off watching. It started off great and with each subsequent episode got better and better.

I liked Captain Jack from his first appearance in Doctor Who, and remember being disappointed when he wasn’t kept on the show as a sidekick. 

Despite my constant requests, there’s no sign of CableVision getting BBC America, so I may have to bite the bullet and fork out the extortionate price for Torchwood seasons 1&2.

All this has got me thinking about some of the other science fiction spin-offs I’ve enjoyed. Stargate Atlantis (mostly) and of course the Star Trek: DS9, Star Trek: Voyager, and to a certain extent Star Trek: Enterprise..

           

Considering the relatively small number of sci-fi shows compared to regular comedy, crime, drama etc, I’d say the proportion of successful spin-offs is far higher in the science fiction genre.

I’ve been trying to think of any non-sf shows I’ve enjoyed which were spin-offs, but the only ones I can come up with are Angel   
and Frasier    .