Starship Invasions

The plot concerns the black-clad Legion of the Winged Serpent, a rogue group of human-like telepathic aliens led by Captain Rameses (Christopher Lee). The Legion's home planet Alpha in the Orion constellation is about to be destroyed in the imminent supernova of its star, and Rameses is leading a small force of flying saucers to Earth to examine its suitability for their race. Performing several alien abductions, they discover they are descendants of transplanted humans, and thus the Earth is perfect for them. They cover their tracks using a device that causes the abductees to commit suicide after a short time. They plan to take over after using a larger version of the device so that everyone on Earth will kill themselves.