Doctor Who just finished airing in the UK and now the trailer for the penultimate episode in the Pond years has been released.

The official description for “The Power of Three” reads:

“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.”

As we pointed out in a post earlier this week, we think we know who the mystery blonde is.

What do you make of the soldiers? A team from U.N.I.T. perhaps?