Go deeper below the surface than ever before with the adventures of the being who is both human and aquatic. Atlantis survivor Mark Harris (played by Patrick Duffy just before starting his lengthy run on Dallas) breathes underwater, withstands extreme depth pressures and wields superhuman strength. And those astounding abilities are showcased in this Collection containing All 13 Exciting Episodes. Submerge with Mark and the crew of the Foundation for Oceanic Research submarine Cetacean (including costars Belinda J. Montgomery and Alan Fudge) into a world of science-fiction wonders. Guest stars include Victor Buono (in several episodes as the villainous Mr. Schubert), Kareem Abdul-Jabbar, Pernell Roberts, Rene Auberjonois and Pat Morita.