#8: Martha Jones, Doctor Who/Torchwood
Martha Jones, played by the stunning Freema Agyeman, isn't exactly a household name in mainstream America, but the same cannot be said of Britain. Martha has appeared on several seasons of British sci-fi mainstay Doctor Who and its spin-off, Torchwood. One look at Freema should explain why she's on this list, but if that's not enough we'll add that Martha can kick alien butt as easily as she can set bones, and she also once single-handedly saved the world. You're welcome, America.