Exclusive: Castle Will get a Mr. Freeze in William Atherton

William Atherton William Atherton has reserved a cool guest just right the approaching season of Castle, TVGuide.com has learned solely.Fall Preview: Get scoop in your favorite coming back showsThe veteran actor will have Dr. Ari Weiss, a "existence-extension investigator" that has devoted the majority of his work to study regarding cryogenic freezing. When Castle (Nathan Fillion) and Beckett (Stana Katic) happen upon a murder scene without any victim, their look for the missing body soon leads these phones Dr. Weiss' work - as well as a lot of other frozen corpses.Atherton, 64, made an appearance in Die Hard and Die Hard 2 in addition to Ghost Busters and Real Genius . His small-screen credits include roles on Existence, Desperate Average women, Law & Order: SVU and also the final season of Lost.Castle exclusive: Star Trek's Michael Dorn is Beckett's shrinkCastle returns Monday, Sept. 19 at 10/9c on ABC. Atherton's episode is slated to air March. 3.