Act 1
Scene 1
A cave in rocks in the forest. An orchestral introduction includes references to leitmotifs including themes relating to the original hoard plundered by the Nibelung Alberich, and one in B-flat minor associated with the Nibelungs themselves. As the curtain rises, Alberich's brother, the dwarf Mime, is forging a sword. Mime is plotting to obtain the ring of power originally created by his brother Alberich. He has raised the human boy Siegfried as a foster child, to kill Fafner, who obtained the ring and other treasures in the opera Das Rheingold and has since transformed himself from a giant to a dragon. Mime needs a sword for Siegfried to use, but the youth has contemptuously broken every sword Mime has made. Siegfried returns from his wanderings in the forest with a wild bear in tow, and immediately breaks the new sword. After a whining speech by Mime about ingratitude, and how Mime has brought him up from a mewling infant ("Als zullendes Kind"), Siegfried senses why he keeps coming back to Mime although he despises him: he wants to know his parentage. Mime is forced to explain how he took in Siegfried's mother, Sieglinde, who then died giving birth to Siegfried. He shows Siegfried the broken pieces of the sword Nothung, which Mime had obtained from her. Siegfried orders him to reforge the sword; Mime, however, is unable to accomplish this. Siegfried departs, leaving Mime in despair.
Scene 2
An old man (Wotan in disguise) arrives at the door and introduces himself as the Wanderer. In return for the hospitality due a guest, he wagers his head on answering any three questions of Mime. The dwarf asks the Wanderer to name the races that live beneath the ground, on the earth, and in the skies. These are the Nibelung, the Giants, and the Gods, as the Wanderer answers correctly. The Wanderer then induces Mime to wager his own head on three further riddles: the race most beloved of Wotan, but most harshly treated; the name of the sword that can destroy Fafner; and the person who can repair the sword. Mime answers the first two questions: the Wälsungs (Siegmund and Sieglinde whose tale is told in the opera Die Walküre) and Nothung. However, he cannot answer the last. Wotan spares Mime, telling him that only "he who does not know fear" can reforge Nothung, and leaves Mime's head forfeit to that person.
Scene 3
Mime despairs as he imagines the ferocity of the dragon Fafner, while "the orchestra paints a dazzling picture of flickering lights and roaring flames". Siegfried returns and is annoyed by Mime's lack of progress. Mime realizes that Siegfried is "the one who does not know fear" and that unless he can instill fear in him, Siegfried will kill him as the Wanderer foretold. He tells Siegfried that fear is an essential craft; Siegfried is eager to learn it, and Mime promises to teach him by taking him to Fafner. Since Mime was unable to forge Nothung, Siegfried decides to do it himself. He succeeds by shredding the metal, melting it, and casting it anew. In the meantime, Mime brews a poisoned drink to offer Siegfried after the youth has defeated the dragon. After he finishes forging the sword, Siegfried demonstrates its strength by chopping the anvil in half with it.
Act 2
Scene 1
Deep in the forest. The Wanderer arrives at the entrance to Fafner's cave, where Alberich is keeping vigil. The two enemies recognize each other. Alberich boasts of his plans to regain the ring and rule the world. Wotan states that he does not intend to interfere, only to observe. He even offers to awaken the dragon so that Alberich can bargain with him. Alberich warns the dragon that a hero is coming to kill him, and offers to prevent the fight in exchange for the ring. Fafner dismisses the threat, declines Alberich's offer, and returns to sleep. Wotan leaves and Alberich withdraws, muttering threats.
Scene 2
At daybreak, Siegfried and Mime arrive. After assuring Siegfried that the dragon will teach him what fear is, Mime withdraws. As Siegfried waits for the dragon to appear, he hears a woodbird singing. He attempts to mimic the bird's song using a reed pipe, but is unsuccessful. He then plays a tune on his horn, which brings Fafner out of his cave. After a short exchange, they fight; Siegfried stabs Fafner in the heart with Nothung. In his last moments, Fafner learns Siegfried's name, and tells him to beware of treachery. When Siegfried withdraws his sword from Fafner's body, his hands are burned by the dragon's blood and he puts his finger in his mouth. On tasting the blood, he finds that he can understand the woodbird's song. Following its instructions, he takes the ring and the magic helmet Tarnhelm from Fafner's hoard.
Scene 3
Outside the cave, Alberich and Mime quarrel over the treasure. Alberich hides as Siegfried comes out of the cave. Siegfried complains to Mime that he has still not learned the meaning of fear. Mime offers him the poisoned drink; however, the magic power of the dragon's blood allows Siegfried to read Mime's treacherous thoughts, and he stabs him to death. He throws Mime's body into the treasure cave and places Fafner's body in the cave entrance to block it. The woodbird now sings of a woman sleeping on a rock surrounded by magic fire. Siegfried, wondering if he can learn fear from this woman, follows the bird towards the rock.
Act 3
Scene 1
At the foot of Brünnhilde's rock. The Wanderer summons Erda, the earth goddess. Erda, appearing confused, is unable to offer any advice. Wotan informs her that he no longer fears the end of the gods; indeed, it is his desire. His heritage will be left to Siegfried the Wälsung, and Brünnhilde (Erda's and Wotan's child), who will "work the deed that redeems the World." Dismissed, Erda sinks back into the earth.
Scene 2
Siegfried arrives, and the Wanderer questions the youth. Siegfried, who does not recognize his grandfather, answers insolently and starts down the path toward Brünnhilde's rock. The Wanderer blocks his path, but Siegfried mocks him, laughing at his floppy hat and his missing eye, and breaks his spear (the symbol of Wotan's authority) with a blow from Nothung. Wotan calmly gathers up the pieces and vanishes.
Scene 3
Siegfried passes through the ring of fire, emerging on Brünnhilde's rock. At first, he thinks the sleeping armored figure is a man. However, when he removes the armor, he finds a woman beneath. At the sight of the first woman he has ever seen, Siegfried at last experiences fear. In desperation, he kisses Brünnhilde, waking her from her magic sleep. Hesitant at first, Brünnhilde is won over by Siegfried's love, and renounces the world of the gods. Together, they hail "light-bringing love, and laughing death."

Prior history
During the lengthy time that has passed since the gods entered Valhalla at the end of Das Rheingold, Fafner has used the Tarnhelm to assume the form of a dragon, and guards the gold and the ring in the depths of the forest. Wotan has visited Erda seeking wisdom, and by her has fathered a daughter, Brünnhilde; he has fathered eight other daughters, possibly also by Erda. These, with Brünnhilde, form the Valkyries, whose task is to recover heroes fallen in battle and bring them to Valhalla, where they will protect the fortress from Alberich's assault should the dwarf recover the ring. Wotan has also wandered the earth, and with a woman of the Völsung race has fathered the twins Siegmund and Sieglinde, who have grown up separately and unaware of each other. From the Volsungs Wotan hopes for a hero who, unencumbered by the gods' treaties, will obtain the ring from Fafner.
Act 1
As a storm rages, Siegmund finds shelter from his enemies in a large dwelling built around a massive ash-tree. Unarmed and wounded, he collapses with exhaustion. Sieglinde enters; she tells Siegmund that she is the wife of Hunding, and that he may rest here until Hunding's return. As they talk, they look at each other with growing interest and emotion. Siegmund gets ready to leave, telling Sieglinde that misfortune follows him and he does not want to bring it on her; she replies that misfortune dwells with her already.
Hunding returns, and questions Siegmund's presence. Calling himself Wehwalt ("woeful"), Siegmund explains that he grew up in the forest with his parents and twin sister. One day he found their home burned down, his mother killed and his sister gone. Recently he fought with the relatives of a girl being forced into marriage. His weapons were destroyed, the bride was killed, and he was forced to flee. Hunding reveals that he is one of Siegmund's pursuers; Siegmund may stay, he says, but they must fight in the morning. Before leaving, Sieglinde gives a meaningful glance to a particular spot on the tree in which, the firelight reveals, a sword is buried to the hilt.
Sieglinde returns, having drugged Hunding's drink. She reveals that she was forced into the marriage and that during their wedding feast, an old man appeared and plunged a sword into the trunk of the ash tree which neither Hunding nor any of his companions have been able to remove. She is longing for the hero who will draw the sword and save her. When Siegmund expresses his love for her, she reciprocates, and when he speaks the name of his father, Wälse, she recognises him as Siegmund, and realises that the sword was left for him. Siegmund then draws the sword from the tree. She reveals herself as Sieglinde, his twin sister. Siegmund names the sword "Nothung" and declares that it will be her protection. The two sing of their passionate love for each other, as the act ends.
Act 2
On a high mountain ridge, Wotan instructs Brünnhilde, his Valkyrie daughter, to protect Siegmund in his forthcoming battle with Hunding. Fricka arrives, and in her role as goddess of family values demands that Siegmund and Sieglinde be punished for their adultery and incest. She scorns Wotan's argument that he requires Siegmund as a "free hero", who can further his plans to recover the ring from Fafner, uninhibited by Wotan's contracts. She retorts that Siegmund is not free but is Wotan's pawn, whose every move the god seeks to direct. Defeated by Fricka's logic, Wotan reluctantly agrees that he will not protect Siegmund. After Fricka leaves, the troubled Wotan gives Brünnhilde the full backstory, and with great sorrow rescinds his earlier instruction; he orders her to give the victory to Hunding, and then departs.
Siegmund and Sieglinde now enter, and Sieglinde faints, consumed with guilt and exhaustion. Brünnhilde tells Siegmund of his impending death; he refuses to follow Brünnhilde to Valhalla when she tells him Sieglinde cannot accompany him. Siegmund still believes that his father's sword will assure him of victory over Hunding, but Brünnhilde tells him it has lost its power. Siegmund threatens to kill both Sieglinde and himself. Much moved, Brünnhilde decides to defy her father and grant victory to Siegmund.
Hunding's call is heard; he arrives, and attacks Siegmund. Under Brünnhilde's power Siegmund begins to overpower Hunding, but Wotan appears and shatters Siegmund's sword with his spear. Hunding then stabs him to death. Brünnhilde gathers up the fragments of the sword and flees on horseback with Sieglinde. Contemptuously, Wotan strikes Hunding dead, and swearing that Brünnhilde will be punished for her defiance, sets out in pursuit of her.
Act 3
The Valkyries congregate on the mountain-top, each carrying a dead hero and chattering excitedly. Brünnhilde arrives with Sieglinde, and begs her sisters for help, but they dare not defy Wotan. Sieglinde tells Brünnhilde that without Siegmund she no longer wishes to live. Brünnhilde informs her that she is pregnant by Siegmund, and urges her to remain alive for the child's sake, and to name the child Siegfried. Brünnhilde gives the fragments of the sword Nothung to Sieglinde, who thanks her for her loyalty and comfort, and resolves to save the child. As she departs, Wotan is heard approaching with great wrath.
When Wotan arrives, the Valkyries vainly try to hide Brünnhilde. He faces her and declares her punishment: she is to be stripped of her Valkyrie status and become a mortal woman, to be held in defenceless sleep on the mountain, prey to any man who finds her. The other Valkyries protest, but when Wotan threatens them with the same, they flee. In a long discourse with Wotan Brünnhilde explains that she decided to protect Siegmund knowing that this was Wotan's true desire. Wotan consents to her request that he surround her resting place with a circle of fire that will protect her from all but the bravest of heroes. He bids her a loving farewell and lays her sleeping form down on a rock. He then summons Loge, the demigod of fire, who creates a circle of flames around her. Before slowly departing, Wotan pronounces that anyone with fear shall never pass through the fire.

Act 1
Scene 1
A cave in rocks in the forest. An orchestral introduction includes references to leitmotifs including themes relating to the original hoard plundered by the Nibelung Alberich, and one in B-flat minor associated with the Nibelungs themselves. As the curtain rises, Alberich's brother, the dwarf Mime, is forging a sword. Mime is plotting to obtain the ring of power originally created by his brother Alberich. He has raised the human boy Siegfried as a foster child, to kill Fafner, who obtained the ring and other treasures in the opera Das Rheingold and has since transformed himself from a giant to a dragon. Mime needs a sword for Siegfried to use, but the youth has contemptuously broken every sword Mime has made. Siegfried returns from his wanderings in the forest with a wild bear in tow, and immediately breaks the new sword. After a whining speech by Mime about ingratitude, and how Mime has brought him up from a mewling infant ("Als zullendes Kind"), Siegfried senses why he keeps coming back to Mime although he despises him: he wants to know his parentage. Mime is forced to explain how he took in Siegfried's mother, Sieglinde, who then died giving birth to Siegfried. He shows Siegfried the broken pieces of the sword Nothung, which Mime had obtained from her. Siegfried orders him to reforge the sword; Mime, however, is unable to accomplish this. Siegfried departs, leaving Mime in despair.
Scene 2
An old man (Wotan in disguise) arrives at the door and introduces himself as the Wanderer. In return for the hospitality due a guest, he wagers his head on answering any three questions of Mime. The dwarf asks the Wanderer to name the races that live beneath the ground, on the earth, and in the skies. These are the Nibelung, the Giants, and the Gods, as the Wanderer answers correctly. The Wanderer then induces Mime to wager his own head on three further riddles: the race most beloved of Wotan, but most harshly treated; the name of the sword that can destroy Fafner; and the person who can repair the sword. Mime answers the first two questions: the Wälsungs (Siegmund and Sieglinde whose tale is told in the opera Die Walküre) and Nothung. However, he cannot answer the last. Wotan spares Mime, telling him that only "he who does not know fear" can reforge Nothung, and leaves Mime's head forfeit to that person.
Scene 3
Mime despairs as he imagines the ferocity of the dragon Fafner, while "the orchestra paints a dazzling picture of flickering lights and roaring flames". Siegfried returns and is annoyed by Mime's lack of progress. Mime realizes that Siegfried is "the one who does not know fear" and that unless he can instill fear in him, Siegfried will kill him as the Wanderer foretold. He tells Siegfried that fear is an essential craft; Siegfried is eager to learn it, and Mime promises to teach him by taking him to Fafner. Since Mime was unable to forge Nothung, Siegfried decides to do it himself. He succeeds by shredding the metal, melting it, and casting it anew. In the meantime, Mime brews a poisoned drink to offer Siegfried after the youth has defeated the dragon. After he finishes forging the sword, Siegfried demonstrates its strength by chopping the anvil in half with it.
Act 2
Scene 1
Deep in the forest. The Wanderer arrives at the entrance to Fafner's cave, where Alberich is keeping vigil. The two enemies recognize each other. Alberich boasts of his plans to regain the ring and rule the world. Wotan states that he does not intend to interfere, only to observe. He even offers to awaken the dragon so that Alberich can bargain with him. Alberich warns the dragon that a hero is coming to kill him, and offers to prevent the fight in exchange for the ring. Fafner dismisses the threat, declines Alberich's offer, and returns to sleep. Wotan leaves and Alberich withdraws, muttering threats.
Scene 2
At daybreak, Siegfried and Mime arrive. After assuring Siegfried that the dragon will teach him what fear is, Mime withdraws. As Siegfried waits for the dragon to appear, he hears a woodbird singing. He attempts to mimic the bird's song using a reed pipe, but is unsuccessful. He then plays a tune on his horn, which brings Fafner out of his cave. After a short exchange, they fight; Siegfried stabs Fafner in the heart with Nothung. In his last moments, Fafner learns Siegfried's name, and tells him to beware of treachery. When Siegfried withdraws his sword from Fafner's body, his hands are burned by the dragon's blood and he puts his finger in his mouth. On tasting the blood, he finds that he can understand the woodbird's song. Following its instructions, he takes the ring and the magic helmet Tarnhelm from Fafner's hoard.
Scene 3
Outside the cave, Alberich and Mime quarrel over the treasure. Alberich hides as Siegfried comes out of the cave. Siegfried complains to Mime that he has still not learned the meaning of fear. Mime offers him the poisoned drink; however, the magic power of the dragon's blood allows Siegfried to read Mime's treacherous thoughts, and he stabs him to death. He throws Mime's body into the treasure cave and places Fafner's body in the cave entrance to block it. The woodbird now sings of a woman sleeping on a rock surrounded by magic fire. Siegfried, wondering if he can learn fear from this woman, follows the bird towards the rock.
Act 3
Scene 1
At the foot of Brünnhilde's rock. The Wanderer summons Erda, the earth goddess. Erda, appearing confused, is unable to offer any advice. Wotan informs her that he no longer fears the end of the gods; indeed, it is his desire. His heritage will be left to Siegfried the Wälsung, and Brünnhilde (Erda's and Wotan's child), who will "work the deed that redeems the World." Dismissed, Erda sinks back into the earth.
Scene 2
Siegfried arrives, and the Wanderer questions the youth. Siegfried, who does not recognize his grandfather, answers insolently and starts down the path toward Brünnhilde's rock. The Wanderer blocks his path, but Siegfried mocks him, laughing at his floppy hat and his missing eye, and breaks his spear (the symbol of Wotan's authority) with a blow from Nothung. Wotan calmly gathers up the pieces and vanishes.
Scene 3
Siegfried passes through the ring of fire, emerging on Brünnhilde's rock. At first, he thinks the sleeping armored figure is a man. However, when he removes the armor, he finds a woman beneath. At the sight of the first woman he has ever seen, Siegfried at last experiences fear. In desperation, he kisses Brünnhilde, waking her from her magic sleep. Hesitant at first, Brünnhilde is won over by Siegfried's love, and renounces the world of the gods. Together, they hail "light-bringing love, and laughing death."

Prior history
During the lengthy time that has passed since the gods entered Valhalla at the end of Das Rheingold, Fafner has used the Tarnhelm to assume the form of a dragon, and guards the gold and the ring in the depths of the forest. Wotan has visited Erda seeking wisdom, and by her has fathered a daughter, Brünnhilde; he has fathered eight other daughters, possibly also by Erda. These, with Brünnhilde, form the Valkyries, whose task is to recover heroes fallen in battle and bring them to Valhalla, where they will protect the fortress from Alberich's assault should the dwarf recover the ring. Wotan has also wandered the earth, and with a woman of the Völsung race has fathered the twins Siegmund and Sieglinde, who have grown up separately and unaware of each other. From the Volsungs Wotan hopes for a hero who, unencumbered by the gods' treaties, will obtain the ring from Fafner.
Act 1
As a storm rages, Siegmund finds shelter from his enemies in a large dwelling built around a massive ash-tree. Unarmed and wounded, he collapses with exhaustion. Sieglinde enters; she tells Siegmund that she is the wife of Hunding, and that he may rest here until Hunding's return. As they talk, they look at each other with growing interest and emotion. Siegmund gets ready to leave, telling Sieglinde that misfortune follows him and he does not want to bring it on her; she replies that misfortune dwells with her already.
Hunding returns, and questions Siegmund's presence. Calling himself Wehwalt ("woeful"), Siegmund explains that he grew up in the forest with his parents and twin sister. One day he found their home burned down, his mother killed and his sister gone. Recently he fought with the relatives of a girl being forced into marriage. His weapons were destroyed, the bride was killed, and he was forced to flee. Hunding reveals that he is one of Siegmund's pursuers; Siegmund may stay, he says, but they must fight in the morning. Before leaving, Sieglinde gives a meaningful glance to a particular spot on the tree in which, the firelight reveals, a sword is buried to the hilt.
Sieglinde returns, having drugged Hunding's drink. She reveals that she was forced into the marriage and that during their wedding feast, an old man appeared and plunged a sword into the trunk of the ash tree which neither Hunding nor any of his companions have been able to remove. She is longing for the hero who will draw the sword and save her. When Siegmund expresses his love for her, she reciprocates, and when he speaks the name of his father, Wälse, she recognises him as Siegmund, and realises that the sword was left for him. Siegmund then draws the sword from the tree. She reveals herself as Sieglinde, his twin sister. Siegmund names the sword "Nothung" and declares that it will be her protection. The two sing of their passionate love for each other, as the act ends.
Act 2
On a high mountain ridge, Wotan instructs Brünnhilde, his Valkyrie daughter, to protect Siegmund in his forthcoming battle with Hunding. Fricka arrives, and in her role as goddess of family values demands that Siegmund and Sieglinde be punished for their adultery and incest. She scorns Wotan's argument that he requires Siegmund as a "free hero", who can further his plans to recover the ring from Fafner, uninhibited by Wotan's contracts. She retorts that Siegmund is not free but is Wotan's pawn, whose every move the god seeks to direct. Defeated by Fricka's logic, Wotan reluctantly agrees that he will not protect Siegmund. After Fricka leaves, the troubled Wotan gives Brünnhilde the full backstory, and with great sorrow rescinds his earlier instruction; he orders her to give the victory to Hunding, and then departs.
Siegmund and Sieglinde now enter, and Sieglinde faints, consumed with guilt and exhaustion. Brünnhilde tells Siegmund of his impending death; he refuses to follow Brünnhilde to Valhalla when she tells him Sieglinde cannot accompany him. Siegmund still believes that his father's sword will assure him of victory over Hunding, but Brünnhilde tells him it has lost its power. Siegmund threatens to kill both Sieglinde and himself. Much moved, Brünnhilde decides to defy her father and grant victory to Siegmund.
Hunding's call is heard; he arrives, and attacks Siegmund. Under Brünnhilde's power Siegmund begins to overpower Hunding, but Wotan appears and shatters Siegmund's sword with his spear. Hunding then stabs him to death. Brünnhilde gathers up the fragments of the sword and flees on horseback with Sieglinde. Contemptuously, Wotan strikes Hunding dead, and swearing that Brünnhilde will be punished for her defiance, sets out in pursuit of her.
Act 3
The Valkyries congregate on the mountain-top, each carrying a dead hero and chattering excitedly. Brünnhilde arrives with Sieglinde, and begs her sisters for help, but they dare not defy Wotan. Sieglinde tells Brünnhilde that without Siegmund she no longer wishes to live. Brünnhilde informs her that she is pregnant by Siegmund, and urges her to remain alive for the child's sake, and to name the child Siegfried. Brünnhilde gives the fragments of the sword Nothung to Sieglinde, who thanks her for her loyalty and comfort, and resolves to save the child. As she departs, Wotan is heard approaching with great wrath.
When Wotan arrives, the Valkyries vainly try to hide Brünnhilde. He faces her and declares her punishment: she is to be stripped of her Valkyrie status and become a mortal woman, to be held in defenceless sleep on the mountain, prey to any man who finds her. The other Valkyries protest, but when Wotan threatens them with the same, they flee. In a long discourse with Wotan Brünnhilde explains that she decided to protect Siegmund knowing that this was Wotan's true desire. Wotan consents to her request that he surround her resting place with a circle of fire that will protect her from all but the bravest of heroes. He bids her a loving farewell and lays her sleeping form down on a rock. He then summons Loge, the demigod of fire, who creates a circle of flames around her. Before slowly departing, Wotan pronounces that anyone with fear shall never pass through the fire.