Três nos depois dum vírus zumbi nos Estados Unidos, um grupo de herois deberam transportar o único sobrevivente da praga de Nova Iorque a California.

Nerdy middle schooler Tommy is forced take care of a baby dinosaur after his cloned science fair project hatches early. He quickly begins to think of the creature not only as a pet, but also as a friend. But when the dino escapes on the day of the fair, Tommy must figure out a way to get the creature back before greedy grown-ups get to the dinosaur first.