In a time of myth, when Vikings ruled the land, when their berzerker rage went unmatched by anyone who opposed them. In this fierce and merciless time, the legendary warrior Rainulf the Wraith-Stalker is summoned by the granddaughter of a dead king to best a deadly enemy. But this enemy is unlike anything Rainulf has ever faced. In the dense, cold mists of this ancient land hides an invincible creature born of the Underworld -- with iron skin, dagger teeth, and blood that burns stone -- known in the far-flung future as an Alien.