With more than 700 episodes, Doctor Who is the longest running science-fiction series of all time, says the Guinness Book of World Records. Long ago, the series hit on the clever idea of creating a sci-fi explanation that would allow the Doctor to appear in a various "incarnations" therefore neatly explaining away periodic changes in actors, and allowing the series to remain fresh. In fact, in its twenty-first century version, which followed a near-decade break in production from 1996 until Christopher Eccleston picked up the role in 2005, The Doctor seems as popular as ever.

Doctor Who first appeared on the BBC in 1963. "The Time Lord" has been played by ten actors in all. David Tennant now has the role, and season two episodes of the new Doctor Who will appear in the U.S. on the SciFi Channel beginning tonight, with "New Earth." Billy Piper is still along as plucky Rose.

Who's your favorite Doctor?

If you enjoyed the 'first' season of Doctor Who on SciFi, you'll be glad to hear that the show's coming back to SciFi with season two. The fresh season brings a the new Doctor (revealed in last season's finale) now played by David Tennant along with Billy Piper reprising her role as Rose Tyler.

In the US, we get to see The Doctor second hand. Martin Conaghan already reviewed them for the British season, but you might want to check out his reviews as the season replays in the US. Martin is kind enough to note when he's revealing spoilers but you might want to check them out after you've caught the latest episode.

If you've never seen the new Doctor Who, it's worth checking out. British humor seems to have a sardonic twist that appeals to me. Who else would could pull off a show with a killer Christmas tree?

The first episode of Doctor Who season two premiers on Friday, September 29th at 8/7C.