A knightly quest for the power of the fabled Holy Grail forms the basis of one of Richard Wagner's most powerful operatic works, presented here in a Bayreuth production staged by noted film director Werner Herzog. Paul Frey, Cheryl Studer, Gabriele Schnaut, Manfred Schenk star. 3 1/2 hrs. Soundtrack: German; Subtitles: English. In German with English subtitles.