During the reign of the Vikings, Kainan, a man from a far-off world, crash lands on Earth, bringing with him an alien predator known as the Moorwen. Though both man and monster are seeking revenge for violence committed against them, Kainan leads the alliance to kill the Moorwen by fusing his advanced technology with the Viking's Iron Age weaponry. In 709 AD, in the Iron Age, a spacecraft crashes in the Viking kingdom of Herot, Norway, and the pilot Kainan survives.
He turns the beacon on; learns the language and culture of the planet using a machine; and finds that the predator, Moorwen, that he was transporting, had escaped. While chasing the alien monster, he finds a village completely destroyed and is arrested by the warrior Wulfric, believing that he killed the locals - Kainan is brought to Herot as a prisoner.
