
"They deal with anti-terrorism, assassinations, political intrigue," said Marshall.
The original crime-action drama series produced by Avengers Mk1 Productions and London Weekend Television aired on the ITV network from 1977 to 1983. 57 episodes were produced, starring actors Martin Shaw, Lewis Collins and Gordon Jackson as agents of 'CI5', a law enforcement department, instructed by the Home Secretary to use any means, dealing with crimes of a serious nature that go beyond the capacity of the police.

Led by 'George Cowley', CI5 is known for using unconventional and sometimes illegal methods to bust criminals, assigning agents 'Ray Doyle' an ex-detective constable who has worked the seedier parts of London and 'William Bodie', an ex-paratrooper, mercenary and SAS sergeant.
"The slogan, or kind of the tagline for the film, is 'Fight fire with fire' and that was their whole thing," said Marshall.

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