Many science fiction films include elements of mysticism, occult, magic, or the supernatural, considered by some to be more properly elements of fantasy or the occult (or religious) film. This transforms the movie genre into a science fantasy with a religious or quasi-religious philosophy serving as the driving motivation. The movie "Forbidden Planet" employs many common science fiction elements, but the film carries a profound message - that the evolution of a species toward technological perfection (in this case exemplified by the disappeared alien civilization called the "Krell") does not ensure the loss of primitive and dangerous urges. In the film, this part of the primitive mind manifests itself as monstrous destructive force emanating from the Freudian subconscious, or "Id".