Behind-the-scenes look at Doctor Who. David Tennant has taken on the Time Lord's mantle, becoming the tenth Doctor. We learn all about his regeneration at the end of series one and follow him as he chooses his outfit in The Christmas Invasion. We then join the Doctor and Rose on their first together adventure together on New Earth and share in the waterlogged wonder of the unforgettable lift shaft sequence, where David and Billie receive a good old soaking.