"Torchwood" is a British science fiction series that premiered in 2006, created by Russell T Davies. A spin-off of "Doctor Who," it follows the Torchwood Institute, a secret organization led by Captain Jack Harkness (John Barrowman), dedicated to investigating extraterrestrial incidents and defending Earth from alien threats. The series is known for its darker, more mature themes, blending action, mystery, and character-driven drama.