Torchwood is a British science fiction television programme, created by Russell T. Davies. The series is a spin-off from Davies' 2005 revival of the long-running science fiction programme Doctor Who, which has a family audience. Torchwood, however, is aimed at a mature audience.

It follows the exploits of a small team of alien-hunters, who make up the Cardiff branch of the Torchwood Institute, which deals mainly with incidents involving extraterrestrials. Its central character is Captain Jack Harkness (John Barrowman), an ex-con man from the distant future who has lived on Earth since the 19th century. Originally a character in Doctor Who, under Jack's leadership, the formerly morally ambivalent organisation operates under a much more humanist ethos. Other than Barrowman, the series' initial main cast consisted of Eve Myles, Burn Gorman, Naoko Mori and Gareth David-Lloyd. Their characters are each specialists for the Torchwood team, often tracking down aliens and defending the planet from alien and nefarious human threats. The upcoming fourth series features two new main cast members. Source - Wikipedia