ER is an Emmy-winning American serial medical drama created by novelist Michael Crichton and set primarily in the emergency room of fictional County General Hospital in Cook County, Chicago, Illinois. It shares some cast and crew members with Oz.
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- John Doman has a recurring role as Dr. Carl DeRaad in seasons 5 to 9 of ER and plays Edward Galson in Oz.
- Michael Hyatt plays Yvonne Devilliere in the season 13 ER episode "Breach of Trust" and played Sadia Khan in the Oz episode "Out O' Time"