Jack Harkness

Captain Jack Harkness was a con man from the 51st Century and he is in charge of Torchwood Three. In Season 1, episode 12 entitle Captain Jack Harkness, Toshiko and Jack are transported back to the 1940s where it is revealed that Captain Jack Harkness is not his real name and that he in fact stole it from a dead soldier during ww2, when they come face to face with the real Captain Jack Harkness the day before he dies.