Fathom

Marine biologist Aspen Matthews has discovered that she's more than human-she's actually a member of an ancient aquatic race, and the key to controlling an incredible source of power. Caught between two factions of mermen struggling for that power, with the planet on the brink of World War III, only Aspen has the chance to stop the destruction before it's too late. But can she do it in time-or will she become the first victim of the approaching Armageddon...?