Ancient North Martian was a language spoken on Mars, presumably by the Ice Warriors. The Tenth Doctor knew the language and spoke in Ancient North Martian, specifcally the sentence, "Hoorghwall in schtochman ahn warrellinsh och fortabellan iin hoorgwahn", to Margaret Cain when she was possessed by the Flood. As Ed Gold noted, she seemed to recognise it. (TV: The Waters of Mars)

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