Dr. Andrew Boran (Kirk Scott) is picking up strange signals from outer space that seem to predict natural disasters. When he and his wife (Sue Lyon) decide to investigate, they find themselves held captive in a convent that's been infiltrated by aliens with plans to destroy the world. As alien leader Zindar (Christopher Lee) explains, the earth is a hotbed of disease that cannot be permitted to continue polluting the galaxy.
~ Fred Beldin, All Movie Guide