Once again the rumour mill is in overdrive due to a report that this years Christmas Special will feature the return of the Yeti and their masters, The Great Inteligence.
The main source of the rumour is down to the image above, which is concept art by Peter Mckinstry created over two years ago for inclusion in a book, but which has gained a new lease of life after making it's way onto several fan forums and news pages, with several now claiming that it has been leaked from the set of the upcoming 2010 Christmas Special. While this year's Christmas Special could very possibly include Yeti, you should rest assured that the image above will have nothing to do with it whatsoever.
The Great Intelligence and its Yeti minions were thwarted twice by the Doctor's second incarnation, played by Patrick Troughton, in the serials The Abominable Snowmen and The Web of Fear. A Yeti was also one of the creatures in the Death Zone featured in The Five Doctors in 1983