An evil alien brain, bent on world domination, takes over the body of an atomic scientist, while a "good" alien brain inhabits the body of the scientist's dog and waits for an opportunity to defeat the evil brain.
The Brain from Planet Arous is a 1957 independently made American black-and-white science fiction film, produced by Jacques R. Marquette, directed by Nathan H. Juran, that stars John Agar, Joyce Meadows, and Robert Fuller. It was written by Ray Buffum. Distributed briefly by Howco International in late 1957, the film appeared in 1958 on a double feature with Teenage Monster (1957).