For more than a hundred years, Captain Jack Harkness had a close association with Torchwood Three; he became its leader in 2000. (TV: Fragments) Though Torchwood Three was significantly smaller than the London branch, with only a handful of employees, after Torchwood One was destroyed in the Battle of Canary Wharf, it became the largest surviving branch of the organisation. (Torchwood Two was a single operative in Glasgow and Torchwood Four was missing.) (TV: Everything Changes)