GAVIN MEETS THE BUILDING’S LEADER

When their plan to infiltrate the Building goes awry, Gavin finds himself face-to-face with its enigmatic leader.

Eve, Levi, Sam and Izzy are forced to rely on a former adversary to lead a rescue attempt.

In 1988, Josh and Riley enjoy some fun before a startling turn.

Air Date: Tuesday Nov. 1 at 9 p.m. on NBC.

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LA BREA -- "Lazarus" Episode 206 -- Pictured: Veronica St. Clair as Riley -- (Photo by: Sarah Enticknap/NBC)