The god Wotan gives the young Prince Sigmund of Valhalla and his sister Brunhilde, the leader of the Valkyries, the task of defending the Petrified Forest. This is threatened by the Vikings (led by the aggressive Hunding), who plans an invasion of the forest in search of the secret treasure of the Nibelung, the possession of which gives one unlimited power. After crossing the border and invading Valhalla, Hunding finds an ally in the daughter of one of Sigmund's loyal followers, Erika, who is embittered by unrequited love. She helps the Vikings raid the camp of the Valhalla residents and kill many warriors. Sigmund swears vengeance and pursues them with the remaining men. However, thanks to other traitors in Sigmund's ranks, Hunding succeeds in capturing him and his fiancée Siglinde, Erika's sister. At the end, Sigmund escapes and, with the help of the Valkiries, succeeds in stopping the invaders and defeating Hunding in a duel.
Gordon Mitchell
as Hunding
Eleonora Bianchi
as Siglinde
Ivica Pajer
as Sigmund
Pamela Tudor
as Brunhilde
Amedeo Trilli
as Gunar
Nat Coster
as Bearded Nibelung
Pietro Ceccarelli
as Erik
Franco Doria
as Knut, the Midget
Attilio Severini
as Fredrik
Franco Beltramme
as Manfred
Lia Giordano
as Blonde Viking Woman
Giorgio Tesei
as Olaf
