« "Anomalies are starting to appear; doorways in time to worlds we can barely imagine. The Anomalies are conclusive proof that the past exists, in a fourth dimension as real and solid as those we already know. Our job is to predict and contain them." »
Series 1 of Primeval is the first series of the original British Primeval television programme. Series 1 focuses primarily on Nick Cutter's team's mission to predict and control the Anomalies and learn why they are happening, and on Cutter's search for answers about the disappearance of his wife Helen.
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. Eventually, Helen seemingly allies with the team to find and contain a futureAnomaly located the past and to combat a deadly predator from the future which is on a killing spree in the present; but while Nick and Helen are searching in the past for the future Anomaly, Nick discovers that Helen only wanted to find the Anomaly and see the future, and after Captain Ryan is killed, Nick returns to the present. However, there, Cutter finds that Claudia Brown has been erased from the timeline while he and Helen were in the past.
A sighting of a large predator leads scientist Nick Cutter and his team to the Forest of Dean - the same forest his wife disappeared into eight years ago. While searching, they find otherstrange beasts and a rip in time leading to the Late Permian Period.
When a giant spider attacks in the London Underground, Cutter's team decends into the maze of tunnels to investigate. However, there are more than spiders lurking in the darkness and soon the team comes face to face with an even more ferocious creature.
An ancient, vicious sea monster attacks a lifegaurd but when the anomaly disappears and reopens several miles away in a reservoir, Cutter realises the key to the Anomalies may lie with his long-lost wife. He must travel through time in a desperate attempt to find her and bring her back to the present.
Helen is captured and interrogated by the Home Office. Elesewhere, a flock of Dodos come through an Anomaly bringing a deadly Parasite with them. Connor's friends steal one, leading to Tom becoming infected and Cutter and the team must find him before they have a pandemic on their hands.
A golfer is apparently killed by a Pteranodon and the team argues over whether to kill it or send it back to the past. When Connor and Abby trek into the forest to find Rex, they quickly learn that the Pteranodon did not come alone.
Helen returns and informs the team of a highly evolved predator from the Future is attacking people in the present, and even worse, breeding. To find the Future Anomaly, Helen and Cutter travel back into the past, but their journey through time causes unexpected and radical changes to the present.