That's Sophia Myles, and she and David Tennant (who plays the Tenth Doctor) actually started going out after Girl in the Fireplace. Guess the chemistry wasn't just on screen! Whenever they're at film premiers, she looks very satisfied, and who can blame her! Doctor Who was around long before The X-Files: it originally started on the BBC back in 1963 and was ongoing for twenty-six years, until it was taken off-air in 1989 (it had been going downhill, but only because the BBC bosses were sick of it and thus messed around with scriptwriters, money, etc.). There are many Doctors and many Companions, there's a whole world for you to discover. :)

I'm glad to hear that Moonlight is doing well, as I'm still mourning Veronica Mars. Oh my God, is Coraline played by Sossamon Shannon, or whatever her name is? I can't believe she's still working.