The series follows the missions of the World Aquanaut Security Patrol (WASP), an organisation responsible for policing the Earth's oceans in the mid-2060s. Headquartered at the self-contained city of Marineville on the West Coast of North America, the WASP operates a fleet of vessels led by "Stingray": a combat submarine crewed by Captain Troy Tempest, Lieutenant "Phones" and Marina, a mute young woman from under the sea. "Stingray"s adventures bring it into contact with undersea civilisations – some friendly, others hostile – as well as mysterious natural phenomena. The WASP's most powerful enemy is King Titan, ruler of the ocean floor city of Titanica.