It connected with its customers through 140 character tweets while providing instant customer service.

FORBES: A Key Ingredient to Successful Movement Marketing

Coleman played a surprise role in last September's season premiere -- as Oswin, a different character from Clara, but one connected to her -- and takes on full companion duties in "The Snowmen" Christmas episode, airing December 25 at 9 p.m.

CNN: Actress Jenna-Louise Coleman talks 'Doctor Who'