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.
Can the mighty UNIT contain Missy? As the Doctor faces his greatest challenge, sacrifices must be made before the day is won.
Written by Steven Moffat
Directed by Rachel Talalay
Guest stars: Michele Gomez, Chris Addison, Sanjeev Bhaskar, Jemma Redgrave, Ingrid Oliver
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