In a deserted ship that drifts into New York Harbor, a series of containers are found having mysterious green eggs inside. If touched, the eggs disintegrate into a toxic liquid that makes human beings explode as soon as the substance hits them. Colonel Stella Holmes is sent to investigate the problem. She discovers a link between the eggs and a recent mission to Mars which has resulted in the disappearance of an astronaut and in the nervous breakdown of his colleague, Commander Hubbard. Holmes and Hubbard join forces and the investigation leads them to a coffee plantation where a heinous plot is taking course.