Two days ago, the fifth season of Dr. Who -- or the 31st season, depending on how you count -- came to a close with an episode called "The Big Bang." Matt Smith, the youngest-ever actor to play the titular Doctor, has therefore finished his very first season with us.

Forget sleigh bells, gift wrap, and tinsel -- Christmas is really about Daleks, Sontarans, and Cybermen. (Who were mostly tinsel themselves back in the old days, but we digress.) That's because since 2005, the BBC has brought us a Doctor Who special each Christmas, and this year, we get the king hell bastard of them all: the story of (spoiler!) the end of David "Number 10" Tennant's tenure as Doctor and the introduction of Matt Smith as the 11th actor to take the role.