For the Cybermen's 50th Anniversary. You will be deleted! This incredible one-off event brings multiple Doctors battling through time to fight the unstoppable Cybermen! Can the Ninth, Tenth, Eleventh and Twelfth Doctors - each battling the Cybermen alone, on a different temporal front - undo the damage that has been wrought on the universe, before they are converted themselves? Or is this how the universe dies? Not in fire, but in metal.