Christmas Special: The End of Time, Pt. 1

S4 E104: It's the Tenth Doctor's final journey - but his psychotic nemesis the Master has been reborn, on Christmas Eve. With both determined to cheat death, the battle ranges from the wastelands of London to the mysterious Immortality Gate. Meanwhile, the alien race Ood warn of an even greater danger approaching, as a terrible shadow falls across the entire Universe.