In the prologue to Wagner's giant masterpiece, Der Ring des Nibelungen, the beginnings of an epic journey unfold when Alberich seizes the ring of gold, it's awesome power unleashing an unstoppable story of deceit, destruction, death and transfiguring love. Filmed at Barcelona's Gran Teatre del Liceu in 2004, Harry Kupfer's stunning production, first staged in Berlin, numbers among the greatest productions of modern times.