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Gwen Elizabeth Cooper was a Cardiff police constable who was recruited by Torchwood Three. She eventually rose to second-in-command and, for a short while, commander of the unit. By 2009, Gwen was the only surviving member beyond the immortal Jack Harkness after Torchwood Three was declared an enemy of the British government.
In 2011, she had severed her ties with Torchwood and begun a relatively peaceful life with her husband, Rhys Williams, and their newborn daughter, Anwen Williams. She remained prepared to fight for survival if the government came after her and resumed operations with Jack during the events of the Miracle.