The Doctor discovers a new menace from another dimension...
Separated from the Doctor, Clara discovers a new menace from another dimension.UPDATE
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.
Here's a very brief BBC One Trailer...
...and here's a little bit longer BBC America Trailer...
Flatline premieres next Saturday, 18th October at 8.25pm on BBC One.
