Meriam Blanc and Nathalie Landry fly for the US Air Force and are at war against the global monster phenomenon known as Leviathan: massive creatures that have risen from the sea to sweep destruction across the land. After a mission to test a new weapon reveals the Leviathan laying eggs by the thousands, Meriam and Nathalie are sent under water. If these new Tesla weapons can destroy the creatures before the surface, maybe humanity has a chance.