People all over the world experience bizarre encounters involving strange new creatures in the oceans. Among those people are Laura Daughtery, a marine bioligist and single mother working in California, Richard Connelly, a Louisiana family man fishing in the Gulf of Mexico, and Miles Bennett, a North Carolina teen who finds one of the creatures' eggs.
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After a mysterious animal carcass is discovered on the shore of Sullivan's Island, Laura and Rich head there to look for some answers but instead get detained for questioning. Also, a team of scientists face a hazardous autopsy of the deceased creature. Meanwhile, Miles decides to name his new discovery Nimrod but faces panic and trouble when Savannah throws a party at which point Nimrod ends up escaping.
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The phenomena becomes more widespread as similar creatures wreak havoc on the coast of Texas. Laura gets more upset with the government especially after she loses her job, while Rich still has a difficult time getting over the loss of his brother as he starts to hear his voice in the water. Cirko and Lee find startling information that may link the creatures to global warming when they begin to dig under the ocean bed. Meanwhile, Miles discovers that it's not safe to raise Nimrod in the backyard when lightning strikes.
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Laura and Jackson head out to sea where she ends up using a GPS device to track one of the creatures. Rich finds proof that the sinkholes in his visions are real causing him to continue obsessing over his brother's death. Meanwhile, Lee tries to talk Cirko out of telling the Pentagon that the new species should be considered extremely dangerous.
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Laura and Richard reunite and use a GPS device to track one of the creatures to a local pier in California while Cirko and Lee consider asking Laura to join them in their investigation. Meanwhile, Miles and Phil fight to keep Nimrod a secret when suspicious Animal Control officers search for a missing neighborhood dog.
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Cirko's life is in danger after he discovers the origin of the mysterious new species. Laura and Rich begin to fear for their own safety when they come into possession of a much sought after sea orchid. Miles sneaks Nimrod out of the house when his parents realize that he's been secretly keeping the animal as a pet.
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Jackson comes to Laura and Rich's aide after they find that Laura's home has been broken into. Miles gets in trouble with the law in his attempt to free Nimrod. And Lee discusses Cirko and the creatures with his superiors.
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Jackson helps Laura and Rich build a submersible so that they can visit a site where the creatures spawn. Meanwhile, the Bennett's consider boot camp as a way to discipline Miles.
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Using the submersible, Laura and Rich learn that the creatures have been laying eggs all over the ocean floor. Miles worries about Nimrod when he hears of trouble at the marine docks. Phil helps look for Nimrod but discovers something else.
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Laura and Rich are in for another shock when they leave the ocean floor and return to the surface. Meanwhile, Savannah suspects that Nimrod's responsible for Miles ending up in the hospital.
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Rich and Laura try to get the footage of their trip to the ocean bottom to a news station before Lee can stop them. Meanwhile, Miles must watch as doctors prepare Nim for an autopsy.
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Laura (Lake Bell) and Rich (Jay R. Ferguson) become fugitives and are being pursued by Lee (Ian Anthony Dale) and his legion of secret agents. While hiding out, Laura has a bizarre Internet exchange with a mysterious person who claims to have information about the origin of the creatures. Meanwhile, Miles (Carter Jenkins) and Caitlin go to a bonfire party at the beach and are stunned when two of her friends mysteriously disappear after a late-night swim. The next day the Coast Guard makes a grisly discovery.
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The search for the mysterious force responsible for the creatures leads Laura and Rich to an abandoned lab. Meanwhile, Miles joins the aquarium crew in searching for the field of unhatched eggs.
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Laura and Rich decide that it's time to get some answers from Lee as Laura considers going back home. Meanwhile, Miles gets in trouble with the local residents after a violent incident with a bully.
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As a massive tsunami heads for the east coast, Laura must save Rich by heading to North Carolina where Miles and his family are trying to escape with their lives.