For Nigel's first adventure, he travels back to Montana during the Cretaceous. His mission: to rescue Tyrannosaurus rex. But he's chosen a risky time to go: just before the meteorite strike that devastated the earth 65 million years ago.

His first rescue attempts don't go according to plan, although he does manage to save a young Triceratops and a herd of ostrich-like Ornithomimus. Only as the meteorite plunges into the earth does Nigel eventually manage to rescue a T-rex, but not the adult he'd been tracking. As a wave of devastation heads towards him, he coaxes two baby tyrannosaurs through the portal and into the park, naming them Terence and Matilda.