Gotterdammerung

Siegfried and Brunnhilde have been shacking up for a while, but he's itching to do manly things again. Brunnhilde sends him out with her horse, Grane: just be back in time for supper. Well, that never happens, because Siegfried is tricked into drinking a potion which makes him fall in love with someone else, and then they trick him into kidnapping Brunnhilde. Why do they want her? She has the Ring; it was Siegfried's wedding present. More dirty tricks and double-dealings; Siegfried ends up dead. Brunnhilde has had enough of this, tosses the Ring into the river, and torches the place. Somehow that causes The Entire World to catch fire and nothing is left but the Rhine River.