A NEW THREAT

When a fog falls over the Clearing, Eve leads a defense against a group of invaders, only to encounter a threat more dangerous than they’ve faced before.

In 1988, Josh and Riley pursue a woman who may hold the key to stopping the impending tidal wave disaster.

Air Date: Tuesday Oct. 18 at 9 p.m. on NBC.

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LA BREA -- "The Fog" Episode 204 -- Pictured: Ming-Zhu Hii as Dr. Rebecca Aldridge -- (Photo by: Sarah Enticknap/NBC)