Erik, a young Viking, discovers that he has no taste for rape and pillage, and suffers guilt over the death of an innocent woman, Helga. Erik learns from the wise woman
Freya that
Fenrir the wolf has swallowed the sun, plunging the world into the age of
Ragnarök. Erik resolves to travel to
Asgard to petition the gods to end Ragnarök. Freya informs him that to do so he must seek the
Horn Resounding in the land of
Hy-Brasil. The first note blown upon the Horn will take Erik and his crew to Asgard, the second will awaken the gods, and the third will bring the crew home. Erik sets out with a crew of all ages and professions from his village, including Harald, a Christian missionary who does not believe the myths. Keitel Blacksmith is persuaded by his apprentice
Loki into secretly opposing Erik's plan, and he joins Erik's crew to sabotage Erik's plans. Loki sneaks out to inform
Halfdan the Black, a local warlord afraid that peace will mean the end of his reign. Halfdan's crew sets sail in pursuit of Erik. Arriving at Hy-Brasil, Erik and crew are astonished to find it a sunlit land where the people, who dress like ancient Greeks, are exceedingly friendly and hospitable (if musically untalented). Erik promptly falls in love with Princess Aud, daughter of King Arnulf. During one of their romantic encounters, Erik hides from Arnulf using Aud's magic cloak of invisibility. Aud has warned the Vikings that should blood ever be shed upon Hy-Brasil, the entire island would sink beneath the waves. Erik and his crew defend Hy-Brasil against Halfdan's ship. Loki is found aboard the ship, and he pretends to have sneaked aboard to sabotage it. In gratitude for Erik's having saved Hy-Brasil, King Arnulf presents him with the Horn Resounding, which is much larger than Erik had imagined. Loki steals the Horn's mouthpiece in the night, without which it cannot be sounded, and persuades Keitel to throw it in the sea. Snorri, one of Erik's men, catches them in the act and Loki kills him. A single drop of the man's blood falls from Loki's dagger and triggers an earthquake that causes the island to sink. Erik's crew prepare to escape in their ship with Aud and the Horn safely aboard. Arnulf refuses to join them, denying that the island is sinking, up to the very moment he and the other islanders are swallowed by the waves. Aud, who witnessed Snorri's murder and was able to recover the mouthpiece, sounds the first note on the Horn. The ship is propelled over the edge of the flat Earth and into space, where it comes to rest upon the plane of Asgard. Erik sounds the second note to awaken the gods, and he and his crew climb a path made of stars to approach the great Hall of
Valhalla. Erik and the crew encounter old friends and enemies slain in battle. The gods are revealed to be petulant children who have no interest in answering mortal prayers. Harald the missionary sees neither hall, nor ghosts or gods, and passes intangibly through its walls due to his Christianity.
Odin persuades Fenrir to spit out the sun, but tells Erik that the end of Ragnarök will not bring peace to the world. Odin then informs Erik that he and his crew cannot return home. Nor may they remain in Valhalla, since they were not slain in battle; instead they are to be cast into the fiery Pit of
Hel. Some of the crew who died earlier in the adventure attempt to save them, but even as they are drawn into the Pit, they hear the Horn Resounding's third note, blown by Harald, who had returned to the ship, which flings them clear. Erik's crew, including the formerly dead men, immediately find themselves back in their home village. They are dismayed to find that Halfdan and his soldiers have arrived before them and are holding the villagers captive. Halfdan and his men are suddenly crushed to death by Erik's ship as it falls out of the sky, with Harald aboard. As the villagers celebrate Erik's return and Halfdan's defeat, the sun rises, ending the age of Ragnarök. ==Cast==