The BBC have today released the TV trailer for the finale of the eighth series of Doctor Who. Starring Peter Capaldi, Jenna Coleman, Michelle Gomez, Jemma Redgrave and many others the episode trailer can be seen below as can the episode’s synopsis:

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.