The BBC have today released the synopsis for the series finale of Doctor Who Series Eight. Entitled Death in Heaven the episode is written by Steven Moffat and stars Peter Capaldi, Jemma Redgrave and Jenna Coleman. The synopsis is below:

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.