Whilst Abby is arguing with Burton,who wants to kill the menagerie,the team gets called to a school where a Therocephalian has come through a gateway and killed a young teacher. Unaware of his fate two nerdy boys in weekend detention accidentally lock the school's security system so that the ARC lads are unable to reach the anomaly. By the time Connor has rectified the system a a whole tribe of the creatures appear and have to be killed with a smoke bomb. Sir James stops Burton from disposing of the animals,making him Abby's hero though she is annoyed at Connor's lack...

Abby and Connor travel to coastal Witchfield Cove,home to the legendary giant worm,after the death of a camper. They find the worm is no myth but a Labyrinthodont,come through a portal in a cave,accidentally opened by a farmer and her son,tipping waste acids. After its disposal Connor accepts a role in Burton's secret project. Matt traces Emily via the black box he has given her and saves her from being buried in a vault,the former burial place of Ethan's sweetheart Charlotte. However Ethan escapes .

Doglike Hyenadons come through an anomaly in the basement of a stately home and when the team go to investigate they meet ex-ARC worker Jenny Lewis,who is about to get married in the hall. It is a true epiphany for Jennifer's groom,unaware of her background,as he and other terrified guests watch Jenny and her old colleagues push the creatures back through the portal. Jess saves Becker from being killed by a booby trap rigged up by Ethan,whose police record from 1900 shows him to be a wanted assassin and anarchist in his own time. Matt learns that Emily was once the ...