With Cybermen on the streets of London, old friends unite against old enemies and the Doctor takes to the air in a startling new role. As the Doctor faces his greatest challenge, sacrifices must be made before the day is won.
With the cybermen on the loose in London and the identity of the Missy revealed all is at stake as the Doctor is put in a difficult position. With the help of old friends and Clara can the Doctor stop the villainous Missy's plans of destruction before it is to late...