Billion Dollar Brain is a 1967 British espionage film directed by Ken Russell and based on the novel of the same name by Len Deighton. The film features Michael Caine as secret agent Harry Palmer, the anti-hero protagonist. The "brain" of the title is a sophisticated computer with which an ultra-right-wing organisation controls its worldwide anti-Soviet spy network. Billion Dollar Brain is the third of the Harry Palmer film series, preceded by The Ipcress File (1965) and Funeral in Berlin (1966). It is the only film in which Ken Russell worked as a mainstream 'director-for-hire', and the last film to feature actress Françoise Dorléac.