Die tollkühnen Männer in ihren fliegenden Kisten
During 1965, Sykes made what proved to be the final series of "Sykes and a..." and appearing in three major films. He had a small role in "Those Magnificent Men in their Flying Machines", joining an all-star cast of British and American TV and film luminaries. The spy spoof "The Liquidator" was directed by Jack Cardiff and starred Rod Taylor with Sykes in a secondary role. His third film of that year was the Boulting brothers' "Rotten to the Core" starring Anton Rodgers (who replaced Peter Sellers) with Sykes. Sykes had a minor film role in another spy comedy "The Spy with a Cold Nose" (1966), written by Galton and Simpson.