Image for Exclusive Trail for The Power of Three

Exclusive Trail for The Power of Three

Duration: 00:30

What are the mysterious cubes, and what secrets do they hold?

Available since: Sat 15 Sep 2012

This clip is from

Doctor Who Series 7 Part 1, The Power of Three

4/5 The Doctor and the Ponds puzzle over an unlikely invasion of Earth.

First broadcast: 22 Sep 2012

Image for The Power of Three Not currently available on BBC iPlayer

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