Even in an undersea realm fraught with peril, no mission is too dangerous for the crew of the Seaview, a futuristic, technologically enhanced research submarine commissioned to defend the free world from hostile powers. As their peacekeeping mission intensifies, Admiral Nelson, Commander Crane, and their crew face a formidable onslaught of insidious enemies, from hostile aliens from distant galaxies and monstrous creatures from the deep, to waxen doppelgangers and the imminent threat of nuclear doomsday. Step aboard the Seaview in Irwin Allen's seminal science fiction classic, and prepare yourself for a voyage beyond imagination!