Trapped in a dangerous prehistoric world! It's the largest dinosaur find in history, and the Smithsonian Institute has hired archaeologist Ben Salisbury and his team to head up the archaeological dig. Knowing it will take many months, the group sets out for the Alaskan wilderness with family and friends in tow. But as they make their way through a tunnel that they believe will lead them through a mountain range, they find themselves transported into a terrifying world that resembles prehistoric Earth. This new world is a place of great peril, where each must fight to survive against not only monstrous creatures but aberrant humans who have crossed through the portal before them.