The Chimeran War was a worldwide conflict between humanity and the Chimera. The war began in December 1949 when the Chimera emerged from Russia and rapidly overtook Europe and Asia, eliminating or converting millions of the human population into Chimera in the process. The intentions of the Chimera other than global conquest were mostly unknown until the emergence of advanced alien artifacts and the so-called Chimeran tower network that led to the theory that the Chimera once inhabited Earth in prehistoric times and had motivations to use Earth for an unknown purpose.