The series, created by James Mitchell, originally aired from 1967-1972 and starred Edward Woodward as David Callan, a secret service agent and top assassin.
Big Finish's new audio plays will revisit Callan's murky world of espionage, with The Crown actor Ben Miles replacing the late Woodward.
Frank Skinner will also feature as small-time thief Lonely, a role played in the original TV series by Russell Hunter.
Four new adventures have been adapted from James Mitchell's Telegraph Short Stories by his son Peter Mitchell. "It was a tremendous privilege to be invited to take part in this project," Peter said. "I grew up with David Callan and he was the first television character created by my father which brought him to prominence.
"It was a little bit daunting to take on the responsibility of the adaptations but, strangely, the more I got into writing the scripts, the closer I felt to my Dad. It was an incredibly rewarding experience and I know my father would be delighted to know that, even after all this time, David Callan lives on."
Callan originally ran for four series, followed by a film version in 1974 and a one-off revival episode in 1981.
The new audio plays comprising series one of the new Callan – set for release in July 2018 on CD and as a download – are:
1.1 'File on a Deadly Shot'
Callan goes hunting for an assassin
1.2 'File on a Classy Club'
The stakes are high for Callan when he takes on a gang using a casino for cover
1.3 'File on a Harassed Hunter'
There's a plot to assassinate Hunter and the man behind it murdered his daughter
1.4 'File on an Awesome Amateur'
Callan and Meres are sent to Venice to kidnap a Russian poet
A second series of plays will follow in January 2019.
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