You think it is hard growing up now? Step back 66 million years into the late cretaceous -- during the reign of the king of dinosaurs. T. rex has long inspired awe and wonder across generations. The planet's most legendary carnivores grow to be over forty feet long and weight nine tons. Their bite is more powerful than any terrestrial animal that has ever lived.
Follow Cobolt and Sierra, a mated T. rex pair as they raise their four hatchlings in what is now Hell Creek, Montana. Even in their prime, will their fearsome power and prowess be enough to protect their offspring?