A herd of massive Eocene beasts comes through an anomaly at an off-road motor course. The team arrives, but these giants do not budge easily. The pressure is on to lure the lumbering creatures back through the anomaly—without causing a stampede or being crushed in the process.
To make matters worse, Abby realizes someone is trapped in a tent, which one of the Embolotherium seems intent on trampling. Abby and Sarah try to rescue the civilian, while Connor pursues the other beasts.
Danny finally arrives, late … and with a mysterious woman in tow. Things spiral out of control when the anomaly suddenly snaps shut, and the herd starts to stampede. Danny must stop the herd before it reaches a campsite filled with unsuspecting people.