Take a look at the first set of images from, Doctor Who series 7 episode 4: The Power Of Three – which airs on BBC One on Saturday 22 September at 7.30pm.

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.

The episode guest stars: Mark Williams, Steven Berkoff and Jemma Redgrave and is written by Chris Chibnall, Executive produced by Steven Moffat and Caroline Skinner, Directed by Douglas Mackinnonand Produced by Marcus Wilson.

Just click on the images to enlarge.

© BBC