Today the BBC officially released the synopsis for In the Forest of the Night.
The synopsis is as follows:
One morning, in every city and town in the world, the human race wakes up to face the most surprising invasion yet.
Everywhere, in every land, a forest has grown overnight and taken back the Earth. It doesn’t take the Doctor long to discover that the final days of humanity have arrived…
The episode will air at 8:30pm on the 25th of October.
[Source: Doctor Who TV]