Original: Trapper John, M.D. featured the character of Trapper John McIntyre, played by Pernell Roberts, twenty-eight years after the events of the M \* A \* S \* H film and television series.
Simplified: The most successful M \* A \* S \* H spin-off was Trapper John, M.D., a spin-off of the movie. It starred Trapper John McIntyre (Pernell Roberts), but never talks about anything from the movie.