Gnostics preached that there was an invasion that occurred about 3,600 BC and, about 1,600 years before the Nag Hammadi texts were buried, they wrote that this invasion was like a virus and, in fact, they were hard pressed to describe it. The beings that were invading were called Archons.
These Archons had the ability to duplicate reality, to fool us. They were jealous of us because we have an essence of some kind, a soul, that they don’t possess, and the Nag Hammadi texts describe the Archons. One looks like a reptile and the other looks like an unformed baby or a fetus: http://humansarefree.com/2016/06/rise-of-archons.html