Peter MacNicol has abutting the casting of Grey's Anatomy for a multi-episode arc, TVGuide has abstruse exclusively.

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MacNicol, who starred in Ally McBeal, Numb3rs and 24, will play Dr. Stark, a pediatrics accessory who will be alive carefully with Alex (Justin Chambers).

The 56-year-old amateur will pop in during sweeps for at atomic two episodes.

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Grey's Anatomy affectedness Thursdays at 9/8c on ABC.