The Mill is a visual effects company based in London. They were responsible for creating the CGI for Series 4 and Series 5 filling in the role of Framestore who created the CGI for the previous series of Primeval. The Mill did not return for the spin-off series Primeval: New World, Atmosphere Visual Effects creating the CGI for the show instead. After the series was over, The Mill reused the Raptor/Swimming Theropod model they had created for Episode 5.3 in the episode "Dinosaurs on a Spaceship" of the BBC series Doctor Who and the finale of Impossible Pictures' series Sinbad.