They're loose on the streets of London, and old friends must unite against old enemies as the Doc takes to the air. Can the mighty UNIT contain Missy?
It's the greatest challenge the Doctor has ever faced, but sacrifices must be made before he can win out. Surely he will win though? After all, Doctor Who never fails…
Doctor Who, BBC1, 8pm
Reveal is now on Google Plus! Join us here for the latest pictures, fashion and celebrity news!