When an anomaly opens up in a theater, a mysterious group of time-travelers comes through, followed by a deadly arboreal dinosaur.

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* ArtisticLicensePaleontology: The Tree Creepers are a completely fictional species of dinosaur with no basis in the fossil record.
* {{Lockdown}}: The ARC's new security system triggers one of these when it detects Rex outside of the menagerie.
* MixAndMatchCritters: The Tree Creepers. They look like a mixture of a velociraptor and a monkey, with a prehensile tail to boot.
* TrappedInThePast: This is more or less what the Time Tribe are. They're a group made up of people from across time who got stranded on the wrong side of anomalies. They travel through the anomalies together in the hopes of finding a way back to their time periods. According to Emily, there were fifteen of them.
* UnwittingInstigatorOfDoom: Rex is one of these. By leaving the menagerie, he triggers a full lockdown of the ARC, trapping himself and Phillip Burton in a room as the air gets sucked out of it.