Donald Henry Pleasence was an English actor. He began his career on stage in the West End before having a screen career, which included starring in a 1954 BBC adaptation of George Orwell's Nineteen Eighty-Four, before playing numerous supporting and character roles in films including RAF Flight Lieutenant Colin Blythe in The Great Escape (1963), the villain Ernst Stavro Blofeld in the James Bond film You Only Live Twice (1967), SEN 5241 in THX 1138 (1971), and the deranged Clarence "Doc" Tydon in Wake in Fright (1971).

Ernst Stavro Blofeld is a fictional character and villain from the James Bond series of novels and films, created by Ian Fleming. A criminal mastermind with aspirations of world domination, he is the archenemy of British MI6 agent James Bond. Blofeld is head of the global criminal organisation SPECTRE and is commonly referred to by the codename Number 1 within this organisation. The character was originally written by Fleming as a physically massive and powerfully built man, standing around 6' 3" and weighing 20 st, who had become flabby with a huge belly.