This sci-fi flick from the 1950s tells the fantastical story of Steve March (John Agar), a man whose body has been commandeered by an enormous alien brain named Gor that's bent on conquering the Earth. With the help of another extraterrestrial brain that's taken up residence in the family dog, Sally Fallon (Joyce Meadows) hatches a plan to stop the madness by locating Gor's Fissure of Orlando -- the alien equivalent of an Achilles's heel.