Primeval was going to stay extinct forever if it was not for a herd of very intelligent Future Predators who came through an anomaly in the place the person who made the decision to axed primeval lived.Whoever it was rang the ARC but remembered that he had sacked them.The herd were going to eat him unless he made a deal to bring them back on TV so that is how primeval got revived.Thank God for those Future Predators.