The Neanderthals are back... and they're pissed! Millions of soldiers from Earth's other intelligent species return in spaceships 40,000 years after Homo sapiens supposedly drove them to extinction. They are just as smart as us, much stronger and they want their planet back. An anthropologist named Nick Clayton is the only one who knows how to defeat them, but he'll need to act fast. The Neanderthals are out for revenge, and Earth is only big enough for one kind of human.