Bride-to-be Donna vanishes as she walks down the aisle to marry boyfriend Lance. To her complete astonishment – and the Doctor’s – she reappears in the Tardis. As the Time Lord, still reeling from Rose’s departure, investigates how Donna came to be there, the duo uncover a terrifying enemy. How far will the Doctor go to save Earth from the latest alien threat?
Air Date: 25 December 2006