Michael Evans and his paleontologist father have been invited by the mysterious time-traveling Shannon to visit the complex built around an underwater portal to the Jurassic period, but Mike uncovers a plot to steal one of the dinosaurs--and then Shannon and her trouble-making brother Jeff disappear through the portal.

Michael Evans is in Montana on a dinosaur dig with his paleontologist father, but he certainly never expected to find a live Tyrannosaurus Rex plucked out of its own time and looking for dinner, nor encounter a girl with some very advanced technology trying to trap the beast.

What seems to Mike Evans like a boring dinosaur dig in China turns suddenly dangerous when he finds evidence of a live dinosaur in the neighborhood--and he and his friend Shannon run into a villain in a skull mask called Mr. Bones who is controlling both a feathered dino, and a fierce carnivore.