And in true Doctor Who fashion, it regenerated to keep up with the current incarnation.
Choose Your Doctor
If you prefer Tennant over Smith or visa versa, there's a Doctor Who RPG available for you:
I've always had a soft spot in my heart for U.N.I.T., primarily in the person of the Brigadier and those doomed, brave, often nameless soldiers that keep getting mowed down like Star Trek redshirts.
Perhaps we can take a page from Dog Soldiers and X-COM and put together a proper counter-alien team. Too much killing for The Doctor, you say? Well, he isn't always around, you know.
Of course, you need your own set of (properly frightening) opponents. If the adventures weren't enough for you, you could certainly pick up the Monster Manual of this RPG -- Doctor Who: Aliens & Creatures. Want to tackle the Cybermen, or face off against the Weeping Angels? Then this is the book for you, you mad, doomed soul.