Synopsis In the early hours of the night, young David Maclean sees a flying saucer land and disappear into the sand dunes just beyond his house. Slowly, all of the adults, including his once loving parents, begin to act strangely. All have a telltale injection mark on their neck. Not surprisingly, no one believes him until he manages to convince Dr. Pat Blake of the city health department and Dr. Stuart Kelston from the local observatory, that something is amiss. They manage to mobilize the army for a confrontation with the invaders.