"Kiss Kiss, Bang Bang" is the first episode of the second series of British science fiction television series Torchwood, which was broadcast on BBC Two on 16 January 2008. The episode features a guest appearance from James Marsters as Captain John Hart, the former colleague and lover of the alien hunter Jack Harkness (John Barrowman). In the episode, John double crosses Jack's Torchwood team as part of a plan to steal a diamond from a woman who was murdered.