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
Callan (TV series) again re-cast, this time being played by Peter Egan (better known at the time as a trendy gangster from a controversial TV series, "Big Breadwinner Hog" – now better known for sitcoms such as "Ever Decreasing Circles"). The only recurring actors from the TV series were Woodward as Callan, Russell Hunter as Lonely and Clifford Rose as Dr Snell (who appeared in five episodes of the series from series two, three and four (though it's stated that Callan has never met Snell before)). There are two short story collections On 7 December 2017, Big Finish Productions announced plans to release