The international success of the film led to producer Ward and Tom Adams reprising Charles Vine in two sequels; Where the Bullets Fly (1966) directed by John Gilling and presented by Levine and the 1967 made in Spain film Somebody’s Stolen Our Russian Spy/O.K. Yevtushenko that languished in a vault until a release in the mid 1970s.
Different dialogue appeared in the American print that had much less of the opening Parliamentary satire and the word "Biggles" is replaced by "Batman" when Seraph is talking of his excitement at visiting Secret Service headquarters.
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