On his most famous role as Col. Potter in M*A*S*H, he has some funny although corny lines.
Kind of funny, but corny at times.
Then came M*A*S*H. Morgan played crazed Major General Bartford Hamilton Steele in the third season opener "The General Flipped At Dawn" (9/10/74). Steele is convinced that the 4077th needs to move closer to the front line, to be near the action.
Morgan's memorable performance as the nutso Steele impressed the producers of the show. The following season, Morgan joined the cast of M*A*S*H as the beloved Colonel Sherman T. Potter. Morgan replaced McLean Stevenson, who had left the show at the end of the previous season. Colonel Potter was a career Army officer who was tough yet caring. He was almost like a father figure to the people under his command.
In 1980, Morgan won an Emmy award for his performance on M*A*S*H. Morgan reprised the Potter role in a shortlived spin-off series, AfterMASH.