Dr. John Truman Carter III, portrayed by Noah Wyle, is a fictional medical doctor from the television series ER. The character, called simply "Carter" by most other characters, was introduced in the pilot episode, and, without interruption, was the only main character to have stayed with the show from the beginning of the series in 1994 up to the 2004?2005 season, for a total of eleven consecutive seasons.

Carter was considered the main character of the series after the departure of Dr. Mark Greene after season 8, up until season 11 when Wyle left the show. Wyle decided to leave the show as a regular character at the conclusion of season 11, despite offers to stay.

He cited a budding family and an already lengthy tenure on the show as reasons. Carter was then written out of the show by moving to Africa and marrying his love interest, Makemba Likasu, in the episode aptly titled "The Show Must Go On". Noah Wyle was contractually invited back for a four episode arc in Seasons 12 and 13.

While he did so in Season 12, his Season 13 episodes were pushed back a year to season 14, to make way for other Season 13 storylines. Because of the WGA Strike, ER was renewed for a 15th and final season (it was originally planned to end after Season 14). This allowed Wyle to return for five episodes as part of the show's plan to bring back former regulars who were interested in returning before the end of the series.

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