When a giant spider attacks on the London Underground, Cutter's team descends 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 predator.
When an ancient, vicious sea monster is loose in the water system, Cutter realizes the key to stopping it 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.
A flock of dodos comes through the anomaly and the docile birds bring a deadly parasite with them. Connor's suspicious friends tail him and steal one of the dodos, but when one of them is bitten, they must find him before he can infect anyone else.
Steve and Merton have their hands full when a clay pigeon shoot is sabotaged by a sniper.
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 it 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?
