Callan (TV series) is run by Colonel Hunter. ("Hunter" is a pseudonym for the current Section Chief, like the C of SIS.) The Section removes those who pose a danger to the "innocent" by persuasion, blackmail, extortion or death. David Callan had been the Section's top operator but he had become too curious about his targets and the rationale for their removal. The Section considered him vulnerable, volatile and dangerous and had laid him off to a dead-end book-keeping job for an ungrateful employer. ABC then commissioned a series of six episodes in 1967. In the first episode Callan rejoins the section in
John Callan John Callan John Bartholomew Callan (15 August 1882 – 12 February 1951) was a New Zealand judge. He was a Justice of the Supreme Court (now known as the High Court of New Zealand) (1935–51). Callan was the son of John Bartholomew Callan, a Dunedin lawyer and member of the New Zealand Legislative Council. He was born on 15 August 1882, five years after his family's arrival in New Zealand from Australia. The Callans had migrated from Ireland to Australia with the Gavan Duffy family and Callan was descended from Charles Gavan Duffy. He was educated at the Christian Brothers