2149, la Terre se meurt. Une petite famille ordinaire, les Shannons, partent avec d'autres établir une colonie, 85 millions d'années dans le passé. Meet the Shannons, an ordinary family from 2149. The planet is dying when they are transported back 85 million years to prehistoric Earth where they join Terra Nova, a colony of humans with a second chance to build a civilization. Yes, there are dinosaurs, and they're not all that happy to see the Shannons.