The mad biology student Henry Degowski has bred a cross between a human and an insect in his basement laboratory. He lovingly raises it with human flesh. But the full-grown mutant gets out of his control. This calls Lieutenant Frank Steele of the Houston Police Department to the scene.

Out of the blue, harmless citizens suddenly fall upon their fellow men and brutally slaughter them. The authorities are puzzled. Only Fritjoff Dumpf, a trainee on local private television, uncovers the mystery and takes up the fight against evil