Harlock Saga: Der Ring des Nibelungen (Japanese: ハーロック・サーガ ニーベルングの指環, Hepburn: Hārokku Sāga Nīberungo no Yubiwa) is a manga series written and illustrated by Leiji Matsumoto. An adaptation of Das Rheingold, it tells the story of space pirate Captain Harlock and his crew as they try to stop a man who has stolen gold from the center of the galaxy and forged it into a powerful ring. It was adapted into a six-part original video animation series (three hours in total length).