This was the third and final Charles Vine spy film. The first was The 2nd Best Secret Agent in the Whole Wide World (1965) and the second was Where the Bullets Fly (1966). Tom Adams played Vine in all three films.
Actor Tom Adams played Charles Vine in all three Charles Vine pictures: The 2nd Best Secret Agent in the Whole Wide World (1965), Where the Bullets Fly (1966) and O.K. Yevtushenko (1967).