After a series of Amazonian Indian attacks on US owned petroleum installation in Brazil, both governments start a secret 'special program'. In fact colonel Ezekial's men use GM killer bees to eradicate the tribes. During an Indian attack, reporter Ann Bauer is stung, yet survives after a mysterious rescue.
The crew of the space shuttle Oklahoma comes back to Earth, one of its crew members having been struck in the arm by a tiny meteor, which evidently contains alien lifeforms. This alien life parasitizes its human hosts to evolve into rapidly proliferating insect-like creatures. The Oklahomas chief medical officer works to stop the spread of the infestation before it reaches the "threshold" population, at which humanity will be effectively unable to contain it and the alien life will take over.