Doctor Who: The Power of Three - Synopsis

The BBC Media Centre have released the synopsis for the fourth episode of the new series of Doctor Who:

THE POWER OF THREE - by Chris Chibnall

The Doctor and the Ponds puzzle an unlikely invasion of Earth, as millions of sinister black cubes arrive overnight, almost like presents falling from the sky. But what are they, what’s inside them and most importantly, who sent them? With the international community at a loss, it’s left to the Doctor to unearth who is behind the mystery.

Doctor Who: The Power of Three will broadcast on Saturday 22nd September on BBC One and BBC One HD, a time is to be confirmed.