After a year in the Cretaceous, Abby and Connor finally escape through an anomaly to their own time after finding a lost anomaly device in a raptor's bower, only to be followed through by a giant Spinosaurus. Soon accosted by a brand new ARC team, they manoeuvre the creature into a massive arena, where, dangling from the roof, Connor accidentally drops the device into the Spinosaurus, imploding it from the inside. But being away for so long has left Connor and Abby out of the loop, and they soon find their ARC jobs in jeopardy...