In the wild and inhospitable far north, in the land of Scandinavian myths and runic legends, Viking warriors discover a child in a space capsule. Leif Haraldson adopts him and gives him the names of his gods: Thorgal aergisson, son of Thor (god of lightning) and son of Aegir (master of the sea). The tale takes place in the seventh centur and draws its narrative power from the imaginary world of magic spells and legends, where men and gods mix.