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Which actor stayed the longest on ER?

Noah Wyle, who played Dr. John Carter, made the most appearances on the hit television show ER. He was an original cast member and was a series regular for the first 11 seasons. Wyle cut back his appearances on ER in the mid-2000s and ultimately missed two entire seasons before returning for several episodes in the show’s 15th and final season, which aired in 2009.