A malevolent 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.

John Agaras Steve March
Joyce Meadowsas Sally Fallon
Robert Fulleras Dan Murphy
Thomas Browne Henryas John Fallon
Ken Terrellas Colonel in Conference Room