A woman in a long coat stands before a huge glowing open box in a vast underground hall.

Original artwork, not a still

River Song

Rule one: the Doctor lies.

— Doctor Who • 2005

Behind the line

What it means

Our interpretation.

River Song says it with a shrug, as if reading from a manual, and the line turns the Doctor's whole habit of bluffing into a law of nature. It is affectionate, a little weary, and a warning to anyone who thinks they have been told the truth. Fans took it up as a catchphrase for the series' twisty plots, and it has been quoted back at the Doctor by the show itself many times since.

Context reviewed

In context

Spoilers for Doctor WhoShow the scene

In "The Big Bang" (series 5, episode 13, 2010), Amy and Rory have just watched the Eleventh Doctor die in the museum where the Pandorica is on display, and a Dalek revived by the Pandorica's light is hunting them. River Song deals with the Dalek, and when she comes back she finds their dead Doctor's body gone. Told that the Doctor had said he was dead, she gives her flat reply: "Rule one. The Doctor lies." He had faked it to make them decoys while he set up his plan. River says it again in series 6's "The Wedding of River Song".

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Context reviewed

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