Episode list

A highly advanced Chinese submarine, the Hei Ten Shi, is on a mysterious mission to deliver an otherworldly cargo to the Marianas Trench, the deepest part of the Earth's ocean. The Chinese vessel suffers damage while maneuvering through the tight oceanic canyons. Because the vessel is now sinking rapidly, it enters a race against time to reach its destination, deliver its cargo and rise to the surface. But before it can release the cargo that is weighing it down, the Chinese vessel is intercepted by an American submarine, the USS Dakota, on a routine patrol mission back to Pearl Harbor. The Chinese submarine dives to over 21,000 feet to avoid engagement. But before the Chinese can escape, the cargo "activates" sending out strange pulses of radiation that cause both the American and Chinese submarines to have massive system failures. As the Hei Ten Shi separates the main components of its ship, the Dakota fears an attack and launches its torpedoes destroying a large part of the Hei Ten Shi. One year later, a CIA operative named Whitt Roberts is called to meet with Jason Sterling. Sterling is part of the Blackdoor Group, a highly clandestine arm of the CIA that acts in complete autonomy from the rest of the US Government and its laws. Whitt has been called upon to investigate the disappearance of the Dakota, but Jason Sterling seems to know more than he is letting on. Whitt explains that a powerful signal was sent out from the Marianas Trench. But what is even more unusual is that the signal appears to have been answered from a source in outer space. Jason tells Whitt that he wants him to abandon his search for the Dakota and focus on a new target...in New York City.

Macallan Orsel is a young genetic scientist working at Rockefeller University in New York City. She and her grandmother are the last remaining members of the Orsel clan, a wealthy New York family of intellectual adventurers. She and her research partner and lover Jimmy Saltzer are trying unlock the elements of the human genome that govern aging. Although talented, Macallan has grown a bit fond of breaking the rules and frequently marshals more resources than the University has allocated to her. When she is reprimanded by Head Medical Provost Rhiner, Macallan receives a call from her grandmother's butler Sedgewick. Her grandmother, Amelia Orsel, who has been ill for some time, has lost consciousness and is fading in and out of states of dementia.

Macallan rushes to her grandmother's side. When she arrives, her grandmother is only semiconscious. She recognizes Macallan but begins to speak very strangely. She keeps saying how special Macallan is, and that no one is supposed to know about her. Macallan is puzzled and mentions the word "Leviathan" which causes her grandmother to become very agitated and complains about hearing voices inside her head. Soon, she relapses into unconsciousness leaving Macallan confused and worried. After Sedgewick convinces her to spend the night at her grandmother's lavish Fifth Ave apartment, Macallan discovers a secret staircase under her bed. She follows the staircase to a hidden room occupied by mysterious large sphere with a single word inscribed on it. Leviathan.