The episode will last for 45 minutes, and will conclude at 9.10pm. Flatline, written by Mummy on the Orient Express writer Jamie Mathieson, will air on the same day on BBC America at 9/8C.
Separated from the Doctor, Clara discovers a new menace from another dimension.[Source: BBC]
But how do you hide when even the walls are no protection? With people to save and the Doctor trapped, Clara comes up against an enemy that exists beyond human perception.