Yes, that's the one, and they grew wierd-looking horns, etc. -- "The Day the World Ended" is the name of it. Mike Connors (Mannix) was in it! I was nine then, lived out in the country, and it scared the cr*p out of me... It was actually pretty good, for the genre. Turner Classic ran it a while back, but I missed it; can't find a VHS anywhere.