 Thatcher appeared in classic British films of the late 1930s and 1940s, including "Major Barbara" (1941) and "Great Expectations" (1946), in which he played Bentley Drummle.He moved to Hollywood in the 1950s.He was constantly in demand, invariably lending his looming figure and baleful countenance to sinister or stern roles in popular costume thrillers such as "The Crimson Pirate" (1952), "Blackbeard the Pirate" (1952), "The Robe" (1953) (as the disapproving father of Marcellus), "The Black Shield of Falworth" (1954), "Helen of Troy" (1956), "Darby's Rangers" (1958) and "The 7th Voyage of Sinbad" (1958).