Take a look back at some of the more memorable casting changes in the history of television.
As Harrison's character was gradually phased out during season six, in came nurse Terri Alden, played by Priscilla Barnes, who would stay for the show's final three seasons.
Baltimore Police Department
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U.S. Army Signal Corps
Warner Bros. Television
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Courtesy of NOAA/Institute for Exploration/University of Rhode Island
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