Astronomers investigate a mysterious meteorite shower in a rural English farm field. The rocks which fell, landed in a V-formation. Dr. Richard Arden, preeminent in the field of extraterrestrial study, is not permitted to accompany his colleagues, including his girlfriend Lee Mason, because he is still recovering from the effects of a recent motor accident. The scientists are summarily taken over by some alien force, and others in the area are dying from a mysterious crimson plague, which covers their bodies with drops of blood. Temple seems the only person immune to both maladies, so if he can discover the reason for this immunity, he may yet foil the alien plan to take earthlings back to the moon for their own sinister purposes. 天文学家在调查英国乡村农场的一场神秘的陨石雨。落下的岩石以V形结构降落。理查德·阿登博士是外星研究领域的佼佼者，他不被允许陪同他的同事，包括他的女朋友李梅森，因为他仍在从最近一次车祸的影响中恢复。科学家们立即被一些外星力量接管，而该地区的其他人则死于一场神秘的“深红瘟疫”，血滴覆盖着他们的身体。坦普尔似乎是唯一一个对这两种疾病免疫的人，所以如果他能找到这种免疫力的原因，他可能会挫败外星人为了他们自己的邪恶目的把地球人带回月球的计划。