The 30-year-old actor will depart cult British sci-fi drama Doctor Who after this year’s Christmas Special. Here's what he told BuzzFeed about his decision to leave, the possibility of a female Doctor, stealing socks, and more. At BuzzFeed, you can read my latest story, "The Doctor Is In: Matt Smith On Leaving Doctor Who , A Female Doctor, And More," in which I sit down with Doctor Who star Matt Smith to discuss his decision to leave the British science fiction drama, the possibility of a female Doctor, and what's next for him. Matt Smith is wearing bright turquoise socks. The 30-year-old star of Doctor Who is lolling around on a leather couch deep within the cavernous confines of the Beverly Hilton Hotel in Los Angeles, a day before he’s set to appear on a panel celebrating the 50th anniversary of the British science fiction drama at the Television Critics Association summer press tour. When I draw attention to his socks (they coincidentally match the shirt I...