Many incarnations of the Doctors and their old companions are taken out of time and deposited in the Death Zone on Gallifrey. There, they must battle the Master, Daleks, Cybermen and Yeti in order to reach the Dark Tower and discover the Tomb of Rassilon..
Someone is taking the Doctor's past selves out of time and space, placing them in a vast wilderness – a battle arena with a sinister tower at its center. As the various incarnations of the Doctor join forces, they learn they are in the Death Zone on their home world of Gallifrey, fighting Daleks, Cybermen, Yeti and a devious Time Lord Traitor who is using the Doctor and his companions to discover the ancient secrets of Rassilon, the first and most powerful ruler of Gallifrey..
