The premiere of season four of Primeval was on January 1, 2011. The season four premiere was directed by Mark Everest and written by Paul Mousley. Approximately, 4.45 million people in the United Kingdom watched the season four premiere.
In the season four premiere, Abby and Connor return to present time after being trapped in the Cretaceous period for the past year. Prior to season four, five webisodes written by Sarah Dollard were released by ITV on December 23, 2010. Each episode was two to four minutes in length and provided background information for season four. Tim Bradley directed each of the five webisodes.