He had one of his most memorable roles as Hercules in "Jason and the Argonauts" (1963), followed by his co-starring role as Colour Sergeant Frank Bourne in "Zulu" (1964). He had a leading role as Inspector Sir Denis Nayland Smith in "The Face of Fu Manchu" (1965) and the supporting role of Major Dalby in "The Ipcress File" (also 1965). Other roles include Carl Petersen in the Bulldog Drummond film "Deadlier Than the Male" (1967), as McCune, a devious Australian in the 1967 comedy-adventure The Pink Jungle, Count Contini in the Matt Helm film "The Wrecking Crew" (1969), and 'Lord Ashley's Whore' in John Huston's "The Kremlin Letter" (1969). His many military roles included parts in "Khartoum" (1966), "Tobruk" (1967), "Fräulein Doktor" and "Play Dirty" (both 1969).