People all over the world experience bizarre encounters involving strange new creatures in the oceans. Among those people are Laura Daughtery, a marine biologist 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.

The phenomena becomes more widespread as similar creatures wreak havoc on the coast of Texas. Laura gets more upset after she loses her job, while Rich still has a difficult time getting over the loss of his brother. Rich's situation gets worse when he starts to hear his brother's voice when he is near water. Cirko and Lee find that the creatures have been digging under the ocean bed, which could link them to global warming. Meanwhile, Miles discovers that it's not safe to raise Nimrod in the backyard when lightning strikes.

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.