BBC has debuted the first trailer for the Doctor Who Christmas special entitled "The Snowmen", airing December 25. This episode will give us our first look at Jenna-Louise Coleman, who plays the Time Lord's (Matt Smith) new companion Carla. The good Doctor must square off against the reptilian hybrid Silurian Madame Vastra (Neve McIntosh) and her sidekick Jenny (Catrin Stewart). Check out the latest footage from this special that will inject a dose of sci-fi drama into your holiday festivities.