It is the theory that aliens deliberately placed and manipulated life on Earth, or to put it another way, aliens “intervened” in the development of life on Earth. There are many different versions of Intervention Theory, ranging from those who believe aliens merely seeded life here and then left it to naturally evolve (sometimes called “directed panspermia” or “terraforming”), to those who think aliens were actively involved in genetic manipulation to create domesticated species and humans. Lloyd Pye’s specific version of Intervention Theory proposes that there was at least one deliberate seeding event (the Cambrian Explosion), and that a human-like race of aliens called the Annunaki created humans by combining their own DNA with that of Earth’s native bipedal primates. As incredible as this sounds, there is evidence of DNA tampering in the human genome, and there are ancient written records detailing this incredible intervention.