The newly regenerated Doctor takes Rose home for the festive season, but the regeneration process has tired him out and he ends up falling unconscious - just as the planet comes under threat from evil alien race the Sycorax, who have employed sinister Santas and murderous trees to do their bidding. Christmas special from 2005, featuring David Tennant's first outing as the Time Lord, with Billie Piper and Penelope Wilton