I'm a relative newcomer to Doctor Who. Sure, I know of its illustrious history - the TARDIS, regeneration...the Daleks. Old episodes played on PBS all the time when I was younger, but I never really sat down and watched any. That's pretty odd, since I like science fiction and shows from the UK. Anyway, before series 4 aired, I made it a point to watch every episode of the revived show, starting with 2005's first series. And here we are, at the end of series 4, where everything comes to a head.