William Atherton William Atherton

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

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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 Hard and Die Hard 2 as well as Ghost Busters and Real Genius . His small-screen credits include roles on Life, Desperate Housewives, Law & Order: SVU and the final season of Lost.

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returns Monday, Sept. 19 at 10/9c on ABC. Atherton's episode is slated to air Oct. 3.