Legend tells of the Rheingold, an all-powerful metal used by the gods of Valhalla during the forging of the universe. Legend says that he who wields the Rheingold wields ultimate power over all things; yea, even over the gods themselves. The Nibelheim, former servants of Valhalla who were cast down aeons ago for daring to defy the gods, are once again fomenting a rebellion. Their leader Alberich is on a ruthless quest for the Rheingold and will let nothing stand in the way of his desire to utterly crush Wotan and the gods of Valhalla. Fearing the implications of his actions, his sister Meeme, currently in the service of the space pirate Captain Harlock, warns her friend about Alberich's plans. Together with fellow space pirate Emeraldas, his best friend Tochiro Oyama, and Maetel the eternal traveler, Captain Harlock sets out to thwart Alberich's designs and save the universe ... not for the gods, but for all the living beings it contains.