The BBC have confirmed that episode four of Series 9 and part two of two, Before the Flood, will air on Saturday 10th October at 8.25pm on BBC One, keeping the same timeslot as Under the Lake.
The episode will last 45 minutes, and finishes at 9.10pm. Before the Flood, penned by Toby Whithouse, will air on the same day on BBC America at 9/8C.
On a remote Army outpost, a fearsome alien warlord – the Fisher King – sets in motion a twisted plan to ensure his own survival. The ripples will be felt around the universe. Is this chain of events inevitable? And can the Doctor do the unthinkable?