Trog is a 1970 British science fiction horror film directed by Freddie Francis and starring Joan Crawford, Michael Gough and Bernard Kay. The screenplay was by Peter Bryan, John Gilling and Aben Kandel.

Joan Crawford was an American actress. She started her career as a dancer in traveling theatrical companies before debuting on Broadway. Crawford was signed to a motion picture contract by Metro-Goldwyn-Mayer in 1925. Initially frustrated by the size and quality of her parts, Crawford launched a publicity campaign and built an image as a nationally known flapper by the end of the 1920s. By the 1930s, Crawford's fame rivaled MGM colleagues Norma Shearer and Greta Garbo. Crawford often played hardworking young women who find romance and financial success. These "rags-to-riches" stories were well received by Depression-era audiences and were popular with women. Crawford became one of Hollywood's most prominent movie stars and one of the highest paid women in the United States, but her films began losing money. By the end of the 1930s, she was labeled "box office poison".