THIRD DAY OF THE RING CYCLE. Günter, the lord of the Rhine people, gives Siegfried a love potion that causes Siegfried to forget Brünnhilde and fall in love with Günter's sister Gutrane. Siegfried has given Brünnhilde the Ring as a token of their love, but her Valkyrie sister urges her to destroy it, because their father Wotan has lost his spear and power and is hiding out in Valhalla. Instead, Brünnhilde keeps it, and under the influence of the potion, Siegfried steals it from her. Enraged, Brü...