"Trapper John" is a fictional character from the television series M*A*S*H, which aired from 1972 to 1983. The character, played by Wayne Rogers, is a skilled surgeon and a former trapper who served in the Korean War. He is known for his laid-back attitude, sense of humor, and camaraderie with fellow staff members at the mobile army surgical hospital. The character later inspired a spin-off series titled "Trapper John, M.D.," which aired from 1979 to 1986. In this series, Gregory Harrison portrayed an older version of Trapper John, who works as a chief surgeon in a hospital in San Francisco. The spin-off focused on his medical career and personal life, while maintaining the character's charm and wit.