Siegfried von Xanten defeats the dragon Fafnir and becomes invulnerable by bathing in the beast's blood. He then wins a net of invisibility and the legendary Treasure of the Nibelungs. He falls in love with King Gunther's sister but the king will not allow them to marry unless Siegfried helps the king find a wife too. Siegfried and Gunther travel to Iceland to defeat and win Queen Brunhild.
