Doctor Who showrunner Steven Moffat has revealed more details of the cliffhanger ending to the first half of the next series.
It was previously announced that the show's sixth run will be split in half, starting in spring 2011 and returning in the autumn.
"There will be a huge cliffhanger... that we wouldn't normally do at the end of a series of Doctor Who because it would be too long before it came back," Moffat told Doctor Who Magazine. "[It is] an enormous, game-changing cliffhanger for the Doctor, Amy and Rory. It will change everything for them."
Moffat promised that forthcoming episodes will contain revelations involving the Doctor's friendship with Amy Pond.
He teased: "You will see the Doctor's life change forever, you will gasp in astonishment at the true nature of his relationship with Amy and you will cry out in horror as Rory Williams stumbles to the brink of a tragic mistake."
Doctor Who will return to BBC One this Christmas.