Doctor Who: The Power of Three - synopsis, transmission details

The BBC have published a synopsis and confirmed the transmission details for episode four of Doctor Who Series 7 - The Power of Three.

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.

Guest stars: Mark Williams, Steven Berkoff and Jemma Redgrave

Written by Chris Chibnall
Executive produced by Steven Moffat and Caroline Skinner
Directed by Douglas Mackinnon
Produced by Marcus Wilson

The episode will be broadcast at 7.30pm - 8.15pm on Saturday 22nd September 2012 on BBC One. It is scheduled against ITV1's Red or Black? and the first five minutes of The X Factor.