Mark Harris, the last survivor of Atlantis, has adapted to life underwater with webbed hands, light-sensitive eyes, and the ability to swim for long periods. He draws strength from water and can overpower ordinary men. Mark assists an underwater research institute operated by his human friends, Dr. Elizabeth Merrill and C.W. Crawford, and joins Dr. Merrill on exploratory missions in a high-tech submarine. They encounter bizarre phenomena, including portals, personality-altering substances, an impish creature, and a millionaire's scheme to melt the polar icecaps.
Aired: Sep 22, 1977A water-breathing human, the sole survivor of an underwater civilization call...
