Roger Thornhill is a fictional character from the 1959 Alfred Hitchcock film, North by Northwest. He is portrayed by actor Cary Grant as a suave advertising executive who becomes embroiled in a case of mistaken identity. Thornhill is pursued by spies and government agents after being wrongly accused of being a secret agent. Throughout the film, Thornhill's journey takes him across iconic American landscapes, including the Mount Rushmore monument. His character embodies themes of innocence, adventure, and the struggle for survival, making him a memorable figure in classic cinema.