The setting alternates between prehistory and modern day times in which scientists study the fossilized remains of the creatures in the film. In 2009, a group of paleontologists discover a rare fossil in Kansas. The fossil was previously exposed by a summer rain, and it appears to be a marine reptile, tracing back over 70 million years. It was a female Dolichorhynchops and will be the inspiration for telling the story of Dolly, who travels the Kansas Inland Sea, 80 million years ago during the late Cretaceous period with her family.
The film brings to life some of the most bizarre, ferocious and fascinating creatures to ever inhabit the ocean, incluing Tylosaurus, Xiphactinus, Cretoxyrhina, and Ammonite. It combines animation with recreations in a 3D prehistoric adventure. A journey to the bottom of the ancient oceans dramatizes awe-inspiring creatures.