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Callan is a British action-drama spy television series created by James Mitchell, first airing between 1967 and 1972. It starred Edward Woodward as David Callan, an agent of a state secret service dealing with internal security threats to the United Kingdom. Though portrayed as having responsibilities similar to those of the real-life MI5, Callan's fictional "Section" has carte blanche to use the most ruthless of methods. imdb.com