Aman

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's time equals a hundred years on the the earth's surface (an updating of the famous Japanese tale of Urashima Taro.) When Aman's power lulls the crew into sleep, Tochiro, the soul of the Arcadia's computer, acts on his own to destroy Aman and save the crew.