The third series of the British science fiction programme Primeval began on 28 March 2009 and concluded on 6 June 2009 after airing ten episodes. Primeval follows a team of scientists tasked with investigating the appearance of temporal anomalies across the United Kingdom through which prehistoric and futuristic creatures enter the present. The third series featured dramatic changes to the main cast, seeing the departure of lead actors Douglas Henshall, Lucy Brown and Juliet Aubrey and the introduction of several new lead characters, played by Jason Flemyng, Laila Rouass and Ben Mansfield.