The first image (above) shows the Doctor and the TARDIS in the Children in Need 'prequel', while the second picture (below) is of the Doctor and Coleman's character from the festive episode itself.
The highly-anticipated episode, written by Steven Moffat, introduces Jenna-Louise Coleman the new companion.
Dan Starkey, Neve McIntosh and Catrin Stewart all return as Commander Strax, Madame Vastra and Jenny respectively. The guest cast also includes Tom Ward, Liz White and the 'iconic' Richard E. Grant.
An exclusive prequel and trailer will be broadcast during Children in Need tomorrow at 7.30pm on BBC One.
Children in Need raises money to support disadvantaged children in the UK, click HERE for details on how to donate.
(Source: Radio Times, Doctor Who TV)