Sinister Black Cubes
The Doctor and the Ponds try to determine if these black cubes are the sign of an invasion on Doctor Who. "The Power of Three" is the fourth episode of the show' seventh season.

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BBC America
Doctor Who
Doctor Who Season 7 Episode 4: "The Power of Three"
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Doctor Who Season 7 Episode 4 Quotes

Within three hours the cubes had separate Twitter accounts.

Kay Stewart

Look at you now, all grown up.

The Doctor