A first look at Leonard Nimoy's return to Fringe (pics)

We've got a first look at Leonard Nimoy's return to Fox's Fringe, and you can get a sneak peek after the jump.

Nimoy, who again plays the mysterious William Bell, makes his first appearance in the show's second season in the upcoming fourth episode, "Momentum Deferred."

You can also view the promo below and a behind-the-scenes video here.

Here's how Fox describes the episode:

Recuperating from the traumatic and alarming meeting with Massive Dynamic founder William Bell (guest star Nimoy), Agent Dunham consumes a powerful "fringe" concoction that Dr. Bishop prescribes to stimulate her memory. Meanwhile, the Fringe Division investigates a series of robbery cases in New York, Boston and Chicago that are tied to shape-shifting. As clues are tracked and memories are jogged, another woman experimented on by Dr. Bishop is introduced and a flashback reveals more about Olivia's alternate-reality encounter in the "Momentum Deferred" episode of FRINGE airing Thursday, Oct. 8 (9:00-10:00 PM ET/PT) on FOX. (FR-204) (TV-14 L, V)

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