12 episodes

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6 episodes

Eight years after his wife Helen disappeared, evolutionary zoologist Professor Nick Cutter - along with his friend Stephen Hart, his geeky student Connor Temple, zookeeper Abby Maitland, Special Forces leader Captain Tom Ryan, and government officials James Lester and Claudia Brown - discovers that mysterious rifts in time and space called Anomalies are allowing creature from across Earth's history to run rampant in the present; and the group subsequently become a Home Office research team tasked with predicting the Anomalies and containing the ceatures which come through them, and learning more about the Anomalies and why they are happening. However, Cutter secretly has an agenda of his own about the Anomaly operation: as the team investigate the Anomalies, Cutter begins to find more clues that imply his long-missing wife Helen is alive and living in the past on the other sides of the Anomalies. The rest of the team eventually learn of this, and that Helen is indeed alive and in the past, but she has been greatly changed by her time there and her study into the Anomalies, and the team are uncertain which side she is on.

7 episodes

After returning from the past to find that Claudia Brown has been erased from time, Nick Cutter is forced to cope with other changes, including that the team are now their own Anomaly-combatting organisation called the Anomaly Research Centre. Just when Cutter finally begins to come to terms with losing Claudia, a new PR guru joins the ARC; Jenny Lewis, who is physically identical to Claudia Brown but temperamentally is a completely different person. Meanwhile, though Cutter believes that Stephen has gotten over Helen's betrayal, Stephen has in fact begun seeing Helen again and is becoming torn between her and Cutter; while Connor begins dating the mysterious Caroline Steel.

10 episodes

As the ARC team still reel from Stephen's death, they are joined by several new team members, including new security leader Captain Hilary Becker, and sparky egyptologist Sarah Page. Meanwhile, after discovering a future world where the Earth is overrun with Future Predators, Helen Cutter sets out on a mission in the present against the ARC, whom she blames for the future catastrophe, and launches an attack on the ARC in which Nick Cutter is killed by Helen. The ARC subsequently manage to obtain a mysterious artifact from the future from Helen, which in turn causes military liaison Christine Johnson to target the ARC and attempt to take control of it and get the Artifact for her own purposes.

7 episodes

After a year marooned in the Cretaceous, Connor and Abby finally return to the present to find that the ARC has greatly changed in their absence, and is now funded by entrepreneur Philip Burton and led by the quiet and mysterious Matt Anderson. Connor and Abby are initially not allowed back on the main team due to a new military code, but soon manage to get back on, though they still have to try and earn their old positions on the team back. When two Anomaly travellers (the Victorian lady Emily Merchant and the murderous Ethan Dobrowski) come to the present, Matt takes Emily in, and begins to open up to her on his past and who he really is, while hunting Ethan and trying to protect Emily from him.

6 episodes

Matt's secret mission to find the ARC member that will destroy the future continues, as does Philip's New Dawn project for the Anomalies. After Abby learns of Matt's mission, the latter recruits her into it, while Connor instead joins Philip in the New Dawn project. Connor and Abby's opposing allegiances in turn strains their relationship more and more.