Great British Institute founded by Queen Victoria to protect the British Empire from aliens.
infiltrated by Captain Jack Harkness (stranded on Earth and waiting for the Doctor to return) the Torchwood Institute worked out of four locations including London's Canary Wharf and beneath Cardiff Bay site of a massive temporal rift.
Following the Battle of Canary Wharf in which Torchwood London was destroyed by the Daleks and Cybermen, Captain Jack has reformed Torchwood in the Doctor's honour, protecting the human race from the terrors that await.