Episode Name: The Power of Three
Air date: 9/22/2012
Summary: 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.
Watch or download Doctor Who (2005) – Season 7 Episode 4 – The Power of Three at below links.