Walter Peter Swanwick (29 September 1922 – 14 November 1968) was a British actor best remembered as the "Supervisor" (sometimes called the Controller) in the 1967 TV series, The Prisoner. Swanwick's film career began with bit parts in films such as The African Queen (1951), and he became a recognisable face on British TV during the mid-1960s when he featured in a number of series, including The Avengers and Danger Man where he first worked with later Prisoner star and co-creator, Patrick McGoohan.