The Helicopter Spies is a 1968 feature-length film version of The Man from U.N.C.L.E.'s fourth season two-part episode "The Prince of Darkness Affair". The episodes were originally broadcast in the United States on October 2, 1967, and October 9, 1967, on NBC. Like the television series, it stars Robert Vaughn and David McCallum. It is the seventh such feature film that used as its basis a reedited version of one or more episodes from the series. The film was directed by Boris Sagal and written by Dean Hargrove. Carol Lynley, Bradford Dillman, Lola Albright, John Dehner, Julie London, H.M. Wynant, and Roy Jenson also star in the film.