Episode Overview
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.
Guest Stars
Michelle Gomez
Missy
Ingrid Oliver
Osgood
Chris Addison
Seb
Nick Frost
Santa Claus
Sanjeev Bhaskar
Colonel Ahmed
Jemma Redgrave
Kate Stewart
Samuel Anderson
Danny Pink