Earth vs. the Flying Saucers (1956)
Extraterrestrials traveling in high tech flying saucers contact a scientist as part of a plan to enslave the inhabitants of Earth
Desire Me (1947)
Released from a POW camp at the end of WW2, a French soldier tricks the wife of a fellow POW into believing her husband was killed by the Germans and seduces the grieving woman, but the dead husband eventually returns home
The Giant Claw (1957)
Global panic ensues when it is revealed that a mysterious UFO is actually a giant bird that flies at supersonic speed and has no regard for life or architecture
Giant from the Unknown (1958)
A very large, degenerate, Spanish conqueror is freed from suspended animation by lightning and goes on a killing spree in a small town