William Russell Enoch is an English actor. He achieved prominence in 1956 when he took the title role in the ITV television series The Adventures of Sir Lancelot. In 1963, he became part of the original lead cast of BBC1's Doctor Who, playing the role of schoolteacher Ian Chesterton opposite William Hartnell from the show's first episode until 1965. Russell's film roles include parts in The Man Who Never Was (1956), The Great Escape (1963) and Superman (1978).