Whatever life holds in store for me, I will never forget these words: "With great power comes great responsibility."
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Gwen Elizabeth Cooper is the deuteragonist and lead heroine of the Doctor Who spin-off series Torchwood. She 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 to the British government and married to Rhys Williams. In 2011, she had severed her ties with Torchwood and begun a relatively peaceful life with her husband and 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.
A policewoman, partnered with PC Andy Davidson, Gwen becomes elevated to the team's second-in-command in her own mind, after taking control as leader during Jack's absence. Despite their relationship being tested by Gwen's dishonesty, feelings for Jack Harkness and a tempestuous affair with Owen Harper, Gwen and her live-in boyfriend Rhys eventually get married. Gwen is one of two surviving agents following the destruction of the Cardiff branch of the Torchwood Institute, and goes into hiding following the birth of daughter Anwen. During Miracle Day she is conflicted between her Torchwood duties and her responsibility to her baby daughter and severely ill father.