The stone slab found during the events of Dinosaur King glows again — a sign that the Alpha Gang is threatening dinosaurs in the past. Max and Rex return to the prehistoric era equipped with a new invention: the D-Watch, built by a newly introduced researcher named Reese, which keeps them in contact with their team. They fight through Alpha Cyber Troopers and gang operatives, but Rex is captured by an Alpha Gang device and taken away. In part two, Max and his teammate Zoe press into the Alpha Gang's main fortress to get him back. They fight through Dr. Z's new Alpha Dinosaurs, free Rex, and destroy the fortress itself. Dr. Z and the remaining Alpha Gang escape in an airship.