The Torchwood Institute, or simply Torchwood, is a fictional secret organisation from the British science fiction television series Doctor Who and its spin-off series Torchwood. It was established in 1879 by Queen Victoria after the events of "Tooth and Claw". Its prime directive is to defend Earth against supernatural and extraterrestrial threats. It is later revealed in "Army of Ghosts" that the Torchwood Institute has begun to use their findings to restore the British Empire to its former glory. To those ends, the organisation started to acquire and reverse engineer alien technology. Within Torchwood, an unofficial slogan evolved: "If it's alien, it's ours". According to one base director, Yvonne Hartman, its nationalist attitude includes refusing to use metric units.