In 1931, Crichton began his career in the film industry as a film Editor. His first credit as Editor was Men of Tomorrow (1932). He edited over fifty films, such as Things to Come (1936). Other films he edited included those that were produced by Alexander Korda, such as Cash (1933), The Girl from Maxim's (1933), The Private Life of Henry VIII (1933), Sanders of the River (1935), Elephant Boy (1937) and The Thief of Bagdad (1940). Crichton was paid £8 per week for his editing. In 1940, Crichton began his employment at Ealing Studios. There he edited the film, The Big Blockade (1942). Crichton also served as an associate Producer of the film, Nine Men (1943), which he also edited.