As CSI: Crime Scene Investigation gears up for its 100 th episode, the Las Vegas team will be going back in time with a few guest stars.

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With Marg Helgenberger returning as Catherine Willows, the show will also pick up Jason Priestley (Beverly Hills, 90210) as a reclusive casino mogul named Mr. Witten, according to Entertainment Weekly. It stands to reason that it is his casino that is referenced in the opening scene description provided by the CSI Writers' Room.

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"Ext[erior] Premiere Casino - Night: Dive down to the entrance of the casino. Hear a distant, ghostly voice of the concierge, welcoming casino guests," reads the direction for the opening shot. "Int[erior] Premiere Casino - Night: Push through the Hollywood-themed Casino. Something's odd...it's spooky, desolate. Move over empty roulette table. It's still, but we hear the wheel spin, ball clacking."

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As the investigative team works to connect a current murder to one from nearly a decade ago, the characters will flashback to where they were ten years ago. Meanwhile, Spoiler TV reports that Bethany Joy Lenz (One Tree Hill) will also make an appearance.

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CSI: Crime Scene Investigation will return to CBS for its 14th season on Sept. 25.

Tags: CSI: Crime Scene Investigation