The Spy in the Green Hat is a 1967 feature-length film version of The Man from U.N.C.L.E.s third season two-part episode "The Concrete Overcoat Affair". The episodes were originally broadcast in the United States on November 25, 1966 and December 2, 1966 on NBC. The film was directed by Joseph Sargent and written by Peter Allan Fields with the story by David Victor. Robert Vaughn and David McCallum star in the film as they do in the television series. It is the fifth such feature film that used as its basis a reedited version of one or more episodes from the series.

Plot

Solo and Kuryakin are assigned to infiltrate a THRUSH secret base located in a Sicillian winery. The base is run by Louis Strago, who in conjunction with former Nazi Dr. von Kronen is planning to detonate atomic bombs in the Atlantic Ocean. The bombs will cause the Gulf Stream to divert, wreaking havoc in Europe and the United States and warming Greenland sufficiently for it to become a strategic new home for THRUSH ("THRUSHland").