Aman presides over her realm at the bottom of the Sargasso Sea, within a huge plastic bubble filled with a menagerie of ancient ships, planes, and other vehicles. She sends first an I-boat and then the hulk of the Japanese battleship Musashi to the surface in order to lure the Arcadia into her witch castle, where one day&#039;s time equals a hundred years on the the earth&#039;s surface (an updating of the famous Japanese tale of Urashima Taro.) When Aman&#039;s power lulls the crew into sleep, Tochiro, the soul of the Arcadia&#039;s computer, acts on his own to destroy Aman and save the crew.     (Source: cornponeflicks.org/harlock/mazone.html)

The year is 2977. Mankind has become complacent and stagnant. All work is done by machines, while humans spend all their time on entertainment. But when a mysterious invader from the stars catches Earth unawares, only the legendary space pirate Captain Harlock and the crew of the Arcadia have the will to stand against them. <br><br>
(Source: Anime News Network)

The story on Arcadia's mystery, on which the 13th television episode was based.