An unemployed mechanic discovers strange tracks in his garden. It soon becomes clear that they have been left by mutated insects. Together with his girlfriend Irma, he sets out to investigate where the creatures are coming from. All clues point to a local laboratory.

Meanwhile, the insects multiply in terrifying numbers, becoming a threat to the survival of humanity. Every effort must be made to stop them.

But then an unexpected twist points to a danger that is even greater...