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Captain Jack harkness ( John Barrowman )

Captain Jack Harkness is head of Torchwood Three. Originally from the 51st century Jack was a Time Agent. He met the Doctor in 1941 and travelled with him and Rose for a while until a Dalek invasion of Earth. Jack got killed by the Daleks and was brought back to life, because of this Jack is now immortal.

Gwen Cooper ( Eve Myles )

Gwen Cooper was orinally a police officer but now works for Torchwood. She lives with her boyfriend, Rhys Williams, who is a transport manager. He has no idea that she works for Torchwood and fights aliens for a living.

Dr. Owen Harper ( Burn Gorman )

Owen Harper was working at Cardiff A&E when he was recruited to the join Torchwood. He is now second in command of Torchwood Three

Toshiko Sato ( Naoko Mori )

Like Captain Jack, Toshiko has also met the Doctor during an invasion by the Slitheen. She is Torchwoods technical expert.

Ianto Jones ( Gareth David-Lloyd )

Ianto used to work at Torchwood until it got destroyed during the battle of Canary Wharf. Iantos girlfriend Lisa got converted into a cyberman.