iegfried, son of King Sigmund, hears of the beautiful sister of Gunter, King of Worms, Kriemhild. On his way to Worms, he kills a dragon and finds a treasure, the Hort. He helps Gunther to win Krimhild, a mask that makes him invisible proves to be very useful. But because Brunhild is cursing Kriemhild, she tells her what really happened. Now Brunhild wants Siegfried's head.

Overview from themoviedb.org