07/25/2012 11:59 am ET

'Childrens Hospital': Jon Hamm To Guest Star

Jon Hamm is traveling back in time again, though not to the ’60s. EW has learned that the "Mad Men" actor will guest star in an upcoming episode of the Adult Swim comedy "Childrens Hospital," playing the institution’s founder, Arthur Childrens, in several ’30s-era flashbacks.

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