From Wikipedia:
Primeval is a British science fiction television programme produced for
ITV by
Impossible Pictures. Created by Adrian Hodges and Tim Haines, who previously created the
Walking with... documentary series,
Primeval follows a team of five scientists tasked with investigating the appearance of
temporal anomalies across Great Britain through which
prehistoric and futuristic creatures enter the present.
First broadcast in the UK on 10 February 2007, it has since expanded to an international audience. Overall reception of the programme was positive during the first and second series, maintaining a 25 percent audience share in the United Kingdom during both series to date. Prior to its 9 August 2008 broadcast on BBC America, the programme received generally positive reaction from American critics as well. The third series, which ITV announced on 30 January 2008, began on 28 March 2009 and has now finished. In the US, series 3 premiered on 16 May 2009 on BBC America and has finished airing.
The first series followed the efforts of Professor Nick Cutter and his associates as they investigate the appearance of space-time continuum anomalies (called "earthquakes in time") that allow the passage of life-forms through that invariably threaten the lives of citizens. The British government, in the form of the Home Office becomes involved after a
Gorgonopsid travels through one such anomaly and wreaks havoc in the environs of the Forest of Dean. Professor Cutter's wife, presumed missing in the first episodes, is revealed to have been stuck inside one anomaly for years and is now using the anomalies to try to access the future. The final episode of the first series involves the first appearance of a future anomaly, allowing predators from the future access to the present, and ultimately, the past.
The second series builds upon the first, in establishing that the destroyed camp of time travelers discovered in the first episode was actually that of the team and that they had created their own past. Due to Professor Cutter and his estranged wife's visit to the camp, Professor Cutter believes they affected the
timeline, although this was the second time at the camp (the first was finding the camp, the second time years or months earlier setting up the camp so it can be found by them later), removing key personnel from the first series. The only people aware of the changes to the
timeline are Professor Cutter and his wife.