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
Oliver Callan Galvin had texted Callan before an appearance on "The Saturday Night Show" in relation to "gay jibes" the satirist had directed at him. It was eventually revealed that Galvin had complained (or not complained at all) to RTÉ after what he described as "the most excruciating night of my life" at home on his sofa between his parents in Kerry watching "The Saturday Night Show" when Callan referred to Galvin's "years spent in the closet". Callan impersonated Galvin again on radio the week after the alleged assault. Callan then appeared on "The Saturday Night Show" for an unprecedented second consecutive