 Starting in episode one, with the character of Suzie Costello and continuing primarily with neophyte employee Gwen Cooper, the theme of corruption is present in the narrative, frequently drawing parallels between Suzie and Gwen.In the aforementioned pilot, Suzie comments on how you cannot go back from working for Torchwood, suggesting it has changed her, after she commits a series of murders and an eventual suicide.Later in the series, Gwen finds herself unable to tell her boyfriend Rhys about her double life, and finds herself drawn into a sexual relationship with teammate Owen in "Countrycide" - as had Suzie before her, revealed in "They Keep Killing Suzie".