Today the BBC have confirmed that Death In Heaven the Second part of this series’ season finale will last an hour starting at 8pm and finishing at 9pm (UK time).

Synopisis:

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.

BBC:http://www.doctorwhotv.co.uk/bbc-confirms-hour-long-series-8-finale-68283.htm