Owen Harper MD was a member of Torchwood Three in the 2000s. Following his fiancée Katie's death due to an alien parasite, Owen accepted Jack Harkness's offer to join Torchwood as its medical officer. He had relationships with his colleagues, Suzie Costello and Gwen Cooper, but was unaware of Toshiko Sato's feelings for him for some years. After being killed by Aaron Copley, Owen was restored in a state of living death in which he could not die but also could not heal.