Who joined the MASH cast after having played General Bartford Hamilton Steele in an earlier episode?

After portraying General Bartford Hamilton Steele in a previous episode, actor Harry Morgan joined the main cast of MAS*H as Colonel Sherman Potter. His character became a central figure in the series, bringing a strong presence and leadership to the 4077th Mobile Army Surgical Hospital. Morgan's transition from a guest role to a main character contributed significantly to the show's dynamic and popularity.