At a Cafe, near a river, Caroline was waiting to meet with Connor for a coffee, however he and Abby had to go the ARC. When he arrived, he claimed he had to go and do a presentation for his studies. Caroline was disappointed, and tried to convince him to stay, but with Abby's persuation Connor decilined. He quickly had a drink of a coffee Carroline had brought and left her. Alone, Caroline looked at a picture of Rex on her phone and sent it to an unknown device.
At the ARC, the whole team is there for Connor's reveal of a device made by himself and Oliver Leek. He called it the ADD, or Anomaly Detection Device, designed to pick up new anomalies when they open, but it appears to fail when words reaches the that at Blue Sky Theme Park, a paintballer has been mauled to death after straying too far from his friends. The team investigates and Cutter comes to believe that the attack, although horrible, could be relatively conventional: the animal to blame could be a rogue big cat. Cutter and the Deputy Manager of the park, Valerie Irwin, insist that the park should be evacuated, but Jenny and Peter Campbell, the Park Manager, refuses, believing it would draw too much attention from the press. As Cutter, Abby and Stephen go in search of the animal, Connor is left to look after the safety of the holiday-makers. He disgraces himself when he shoots at what he believes to be an attacking animal, but turns out to be the manager dressed up as the furry park mascot, while unbeknownst to him, the real menace is lurking nearby... The team begin to comb the nearby woodlands for the animal: in the search, Stephen discovers Valerie lost in the woods and offers to take her home, showing great reluctance in evading her questions regarding their work. Meanwhile, whilst waiting for a train, the unfortunate Campbell is attacked and killed at a railway station; Stephen, who is with Valerie, hears screaming and rushes to investigate. He sees the huge animal but is forced to let it flee as he has to protect the terrified Valerie. He is convinced it is too big to be any modern-day species of big cat - it must be a creature from through an anomaly. But with no firm evidence and no clear sighting, the team are baffled.
A train spotter, however, has recorded the whole attack and to Jenny's fury, is about to upload pictures of the creature to the internet; while she manages to pay him off to prevent the media fallout, Cutter is more concerned by what he finds on the pictures - the creature is a Smilodon, or sabre-tooth cat. There can be no doubt - this is an ancient creature: it could only have come through an anomaly. The team are left baffled as to why the anomaly detector failed to work. The team prepare to set traps to catch the creature: however, Valerie reappears and becomes visibly agitated by what they are planning. Stephen is concerned, but Cutter and the others dismiss it as stress and shock over everything that has happened.
While Cutter and Abby dig a pit trap for the creature, they find the mutilated body of a man buried in a shallow grave. The man was clearly mauled by the Smilodon, but more perplexing is the fact that someone must have known about the Smilodon's attack in order to explain the corpse's burial. Before Cutter can work out the implications of this, the cat attacks them, drawn by the scent of the fresh meat they have put out as bait. While Abby fends the Smilodon off with a mechanical digger, Cutter is forced to escape on an zip-wire slung between the trees, only to find the gigantic cat following him below. As he finally lands in easy reach of the cat's claws, Abby gets a shot with a tranquiliser gun, missing but scaring the creature off.
Back at the grave site, Cutter finds a photograph in the buried man's wallet, showing Valerie, the man (evidently her boyfriend) and the Smilodon as a cub. If the Smilodon came through the anomaly when it was a cub, and the anomaly had now closed, then it would explain why it didn't register on the Anomaly Detector. Cutter sets off to search for Valerie. Stephen and the rest of the team spot her car heading off in another direction, but it turns out to be a diversion. Cutter, while searching her house, is cornered by Valerie, who traps him and sets the Smilodon on him, believing it was created in a horrific experiment and that Cutter and the team had come to destroy it: she also confesses to hiding her boyfriend's body after the creature killed him in an unfortunate accident. Cutter warns her that the animal is more than capable of killing them both, but Valerie asserts the cat has imprinted upon her as its mother, and won't harm her. She then flees, abandoning Cutter to his fate.
After a desperate race through the house with the Smilodon in pursuit, Cutter manages to escape the house and arm himself with a pitchfork. As the cat gets loose and comes after him, Valerie puts herself between Cutter and the raging beast, trying to defend it: berserk with bloodlust and hunger, it turns its fury on her, and deals a fatal blow. Just before the Smilodon can kill Cutter as well, the team arrive and Stephen shoots it with a tranquiliser, taking the Smilodon out: sadly it is too late to save Valerie. In the aftermath, Stephen and Cutter argue: Stephen regarding how many more people like Valerie will die before knowledge of the anomalies becomes public, while Cutter accuses Stephen of having told her what they were doing. Stephen denies the accusation, but retorts that he wish he had spoken.
Back at the ARC, Oliver Leek informs Cutter that the Smilodon died being transported back to the ARC. Cutter can't believe him, as the cat was perfectly healthy. Leek suggests shock, or an overdose of tranquilizer, but when Cutter asks to do his own post-mortem, Leek refuses, saying that the body has been destroyed to stop the spread of disease. However, the ADD goes off, indicating there is an active anomaly: the team go to investigate, though Connor laments the fact it will interrupt his plans for a date with Caroline.
It is also then revealed to the viewer that Caroline is working for Leek. In a secluded area, Leek pays Caroline for more information on Connor and Abby, for his own purposes.
- Douglas Henshall as Nick Cutter
- James Murray as Stephen Hart
- Andrew-Lee Potts as Connor Temple
- Hannah Spearritt as Abby Maitland
- Karl Theobald as Oliver Leek
- Lucy Brown as Jenny Lewis
- Naomi Bentley as Caroline Steel
- Gillian Kearney as Valerie Irwin
- Rick Warden as Peter Campbell
- Thomas Aldridge as Warren
- Eloise Joseph as Female Paintballer 1
- Ashley Mulheron as Female Paintballer 2
- Ian Ralph as West
- Heather McHale as Mother
- Rory MacGregor as Kenny Johnson
- John Henry Keating as Mechanic
- Female Paintballer 1 (only appearance)
- Female Paintballer 2 (only appearance)
- Warren (only appearance)
- Connor Temple
- Abby Maitland
- Caroline Steel
- Oliver Leek
- Nick Cutter
- Jenny Lewis
- Stephen Hart
- Valerie Irwin (death, only appearance)
- Peter Campbell (death, only appearance)
- Mother (only appearance)
- Mr. West (only appearance)
- Kenny Johnson (only appearance)
- Mechanic (only appearance)
- Helen Cutter (picture)
- Rex (picture)
- Smilodon (first appearance)
- Forest of Dean
- River Thames
- Café (only appearance)
- Anomaly Research Centre
Objects and technology
- Anomaly Detection Device (first appearance)
- Prototype Handheld Anomaly Detector (only appearance)
- Night-vision goggles
- Actors; Juliet Aubrey and Ben Miller are credited in the opening tiles despite their characters Helen Cutter and James Lester not appearing.
- Thorpe Park was the filming location for Blue Sky Park.
- When the Smilodon killed Peter Cambell, it was up the railway line from the bridge, however when Stephen arrives at the train station, the Smilodon has Peter's body is down the line.
- The Smilodon could have dragged the body there.
- Kenny the train-spotter apparently disappears off the bridge when Stephen arrives at the train station.
- At the end, when Leek gives Caroline her payment, blank pieces of paper can be seen in along with the bank notes.
- The light reflecting off the money makes it look blank.
- Or Leek could have been trying to scam her.
- The light reflecting off the money makes it look blank.
- In Episode 1.4, Helen Cutter had previously lied about some Smilodon coming through an Anomaly.
- Also in Epsisode 1.4, Tom and Duncan assumed the Dodo was the result of secret government experiments. Valerie makes the same assumption about the Smilodon.
- The Anomaly Detection Device first appears in this episode and is present in every Primeval episode after this. It also occurs in all of the Primeval novels.
- In reference to Episode 2.1, the Anomaly Detector was built, conceived from radio interference, discovered at the Shopping mall, that was caused by an Anomaly.
- In reference to Episode 2.2, Connor built the detector as authorised Lester in the previous episode.
- In Episode 2.7:
- Valerie Irwin's death is mentioned.
- The real fate of the Smilodon is revealed
- Episode Guide on itv.com 
- ↑ http://www.bbcamerica.com/primeval/guide/season-2/episode-3/
- ↑ http://www.fernsehserien.de/primeval-rueckkehr-der-urzeitmonster/episodenguide/staffel-2/8020