The Power of Three (TV story)

 was the fourth episode of the seventh series of Doctor Who produced by BBC Wales.

Synopsis
There have been many ways to invade the Earth, and the Doctor has seen them all – or so he always thought. And then the human race wakes up one morning and discovers the world has been overrun by… small black cubes. Which then proceed to… do nothing at all. A plan is afoot, humanity is endangered – but by what and how and, above all, when?

For the first time in his world-saving career the Doctor has to call upon one of the least of his virtues: patience. And the Ponds face something possibly more terrifying than any world-ending apocalypse: the Doctor is moving in!

Plot
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Cast

 * The Doctor - Matt Smith
 * Amy Pond - Karen Gillan
 * Rory Williams - Arthur Darvill
 * Brian Williams - Mark Williams
 * Kate Stewart - Jemma Redgrave
 * Shakri - Steven Berkoff
 * Ranjit - Selva Rasalingam
 * Laura - Alice O'Connell
 * Arnold Underwood - Peter Cartwright
 * Orderly 1 - David Beck
 * Orderly 2 - Daniel Beck
 * UNIT Researcher - David Hartley
 * Brian Cox - Himself (uncredited)
 * Lord Sugar - Himself (uncredited)

Story notes
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Ratings
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Filming locations
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Production errors
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Continuity

 * Rory's father Brian reappears. (TV: Dinosaurs on a Spaceship)
 * The Eleventh Doctor, Amy and Rory have fish custard. (TV: The Eleventh Hour)
 * Kate Stewart is the daughter of Brigadier Alistair Gordon Lethbridge-Stewart. She previously appeared on-screen in HOMEVID: Downtime. She shortened her family name when she joined UNIT as she wanted to be judged on her own merits.
 * It is ten years since the events of The Eleventh Hour.
 * The Doctor, talking to a flying cube, says "Is that all you can do? Hover? I'd a metal dog that could do that" referring to K9 Mark IV (and possibly to K-9 Mark II from K9 (TV series)).

DVD releases
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Blu-ray releases
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