The Brain From Planet Arous (1957)

Gor, a disembodied brain from, you guessed it, Planet Arous, possesses a hard-working American scientist Steve Marsh (John Agar). The brain has nefarious plans for planet Earth, but another brain, Val, from that same Planet Arous, arrives to thwart Gor's machinations. Also features a very young Robert Fuller, known for such shows as Laramie, Wagon Train, and Emergency!