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Exclusive: Castle Gets a Mr. Freeze in William Atherton

William Atherton has booked a chilly guest spot on the upcoming season of Castle, TVGuide.com has learned exclusively.Fall Preview: Get scoop on your favorite returning showsThe veteran actor will play Dr. Ari Weiss, a "life-extension researcher" who has dedicated most of his work to the study of cryogenic freezing...

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Adam Bryant

William Atherton has booked a chilly guest spot on the upcoming season of Castle, TVGuide.com has learned exclusively.

Fall Preview: Get scoop on your favorite returning shows

The veteran actor will play Dr. Ari Weiss, a "life-extension researcher" who has dedicated most of his work to the study of cryogenic freezing. Castle (Nathan Fillion) and Beckett's (Stana Katic) investigation leads them to Dr. Weiss' work.Atherton, 64, appeared in Die Hardand Die Hard 2 as well as Ghost Busters and Real Genius . His small-screen credits include roles on Life, Desperate Housewives, Law & Order: SVUand the final season of Lost.

Castle exclusive: Star Trek's Michael Dorn is Beckett's shrink
Castle
returns Monday, Sept. 19 at 10/9c on ABC. Atherton's episode is slated to air Oct. 3.