One Spy Too Many is the 1966 feature length film version of The Man from U.N.C.L.E.'s two-part season two premiere episode "Alexander the Greater Affair". It, as does the television series, stars Robert Vaughn and David McCallum. It is the third such feature film that used as its basis a reedited version of one or more episodes from the series. In this instance, the film took the two-part episode and added in a subplot featuring Yvonne Craig as an U.N.C.L.E. operative carrying on a flirtatious relationship with Napoleon Solo (Robert Vaughn); Craig does not appear in the television episodes. It also added in and substituted scenes that, while not out of place in a 1960’s U.S. spy film, were more explicitly sexual than generally shown on U.S. television at the time. Whereas the earlier U.N.C.L.E. films added material to a single episode to create a feature length movie, "One Spy Too Many" removed certain elements of the two-part episode to allow for the added subplot with Craig and other enhanced scenes within the film’s overall running time. This was the last film culled from the series to be theatrically released in the U.S. (thetvdb.com)