Meet Kave! He’s the chief of his tribe – or rather was until now. Banished by his own people, he stumbles upon… a jetpack! The device turns him into the only prehistoric man who stands a chance against “the alien invader” – a rather unlikable guy from the sky who’ll readily kick off a disastrous volcanic eruption just so he can repair his spaceship. So begins Kave’s quest to save the whole island and prove his worth to the tribe.