Still reeling from the disappearance of three ARC personnel, the government has lost faith in Lester's abilities to manage the operation. The ARC changes ownership but has questionable leadership and a new team is recruited. After being stranded in the Cretaceous Connor and Abby are very much in love. Danny remains missing in action, and when he does eventually return he has shocking news.
After a year in the Cretaceous, Abby and Connor finally escape through an anomaly after finding a lost anomaly device in a raptor's bower, only to be followed through by a giant Spinosaurus. A new ARC team springs into action, leaving Abby and Connor's place within the team in jeopardy.
When Connor sees his old friend Duncan, he doesn't expect to find him obsessed with creature sightings. The pair track the elusive dock creature down to the docks, only to find evidence of a fresh kill. With Abby and Matt arriving to help, they find the creature after a tense chase through a container yard. Will Connor's quick-thinking and bravery earn him back his place on the team?
A mysterious group come through an anomaly, unknowingly followed by deadly tree creatures. As they try to escape, Matt inadvertently brings one of the group, Emily, back against her will. She promises to help him find the creature, in return for going back through the anomaly. In a frantic chase through the city, they find the creature, to discover the anomaly has closed and Emily is stranded.
Saturday detention is chaos when a deadly Therocephalian attacks a teacher, allowing the kids to run riot. The team are faced with not only tracking down the creatures, but fighting against the antics of a group of terrified students. Finding a Therocephalian nest in the school, Connor enlists the help of the kids to help defeat the creatures before returning them through the anomaly.
Sent to investigate an odd anomaly signal, Connor and Abby uncover the existence of a supposedly mythical Labyrinthodont in a small coastal town. In tracking it down, they come across dangerous fuel-smuggling farmers who put their lives at risk. Back at the ARC, Matt is concerned about Emily's disappearance, and sets out to find her.
While investigating an anomaly at an estate, the team stumble across the wedding of ex-ARC member Jenny Lewis. Things go to plant until Matt and Emily inadvertently let a savage Hyaenadon through an anomaly and Connor falls into a compromised position. As the creatures run riot, Jenny can't help but fall back into ARC mode, as they return the creatures and restore order to the wedding.
When a Terrorbird appears during an incursion, the team are faced with an anomaly that won't lock, causing chaos as a terrified creature struggles to get home. Danny reappears from his journey through the Rift Valley with a warning for the team and suspicions about their new boss. Ethan's secrets are finally revealed as he takes his revenge on Emily and the team.