With cold weather fast approaching, Eve, Levi and Ty return to the mysterious fort despite their near-death experience there in the hopes they might share their 10,000 BC survival skills.

Gavin’s attempts to spare Izzy pain threaten to do their relationship more harm than good.

Air Date: Tuesday, Nov. 16 (09:00PM – 10:00PM) on NBC.

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LA BREA -- "Origins" Episode 108 -- Pictured: (l-r) Jack Martin as Josh Harris, Veroncia St. Clair as Riley Valez -- (Photo by: Sarah Enticknap/NBC)