The aliens are landing!
On a post-apocalyptic earth, the human species has reverted to its ancient native ways, surviving and thriving by hunting and fishing. It will be so easy for the strange invaders to take control.
But... there is one thing left from the old technological age of years before: a machine the earth hominids call "Mother", which can teach them, through revisiting history, how to defend themselves.
Someone, many years ago, once said, "What have the Romans done for us?"
Well... now, their ideas might just save the planet!