The BBC have commissioned Sequence to produce a viral game as part of their multi-platform offering for the 2007 Doctor Who Christmas Special.

Entitled 'Companions Quiz', the game sits behind door four of the advent calendar on the series' website and is a teaser for fans ahead of the Christmas special, which will co-star Kylie Minouge.

Made up of five rounds, the quiz tests the audience's knowledge of the Doctor's various companions and rewards fans with exclusive Doctor Who content according to their in-depth knowledge of the popular series.

Rob Francis from the BBC said "We were very happy to ask Sequence to provide this game development - they have now produced games for us over a number of series and are a fast, trusted agency."