M*A*S*H is an American television series developed by Larry Gelbart, adapted from the 1970 feature film MASH (which was itself based on the 1968 novel MASH: A Novel About Three Army Doctors, by Richard Hooker). The series is a medical drama/black comedy that was produced in association with 20th Century Fox Television for CBS. It follows a team of doctors and support staff stationed at the "4077th Mobile Army Surgical Hospital" in Uijeongbu, South Korea, during the Korean War. M*A*S*H's title sequence featured an instrumental version of the song "Suicide Is Painless", which also appears in the original film. The show was created after an attempt to film the original book's sequel, M*A*S*H Goes to Maine, failed. It is the most well-known version of the M*A*S*H works.
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M*A*S*H Logo

The primary logo for the M*A*S*H television series.
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Hawkeye Pierce

Actor: Alan Alda

Captain Benjamin Franklin "Hawkeye" Pierce is a fictional character and lead protagonist in the M*A*S*H novels, film, and television series. The character was played by Donald Sutherland in the film and by Alan Alda on television. He is both the main character and the only character to appear in every episode of the television series.
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Trapper John McIntyre

Actor: Wayne Rogers

"Trapper" John Francis Xavier McIntyre is a fictional character in Richard Hooker's M*A*S*H novels, as well as the film and the two TV series (M*A*S*H and Trapper John, M.D.) that followed them.
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Henry Blake

Actor: McLean Stevenson

Lieutenant Colonel Henry Braymore Blake is a fictional character introduced in the 1968 novel M*A*S*H, written by H. Richard Hornberger under the pen name of Richard Hooker. He was also a character in the 1970 M*A*S*H film, played by Roger Bowen, and most famously, in the M*A*S*H television series, played by McLean Stevenson.
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Frank Burns

Actor: Larry Linville

Lieutenant Colonel Franklin Delano Marion "Frank" Burns (also known as "Ferret Face") is a fictional character in the M*A*S*H film and television series. Burns first appeared in the original M*A*S*H novel by Richard Hooker, where he had the rank of captain. The character was then portrayed in the film by Robert Duvall (as a major), and in the subsequent television series by Larry Linville as first a major who is then promoted to the rank of Lieutenant Colonel after his departure from the series.
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Margaret Houlihan

Actor: Loretta Swit

Major Margaret J. "Hot Lips" Houlihan is a fictional character first created in the book M*A*S*H: A Novel About Three Army Doctors by Richard Hooker. Actress Sally Kellerman portrayed the character in the Robert Altman film adaptation (where she is sometimes referred to as O'Houlihan). Houlihan was later portrayed by Loretta Swit in the long-running television series.

The character of "Hotlips Houlihan" was inspired by real-life Korean War MASH head nurse Hotlips Hammerly, also a very attractive blonde, of the same disposition, and also from El Paso, Texas.

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Walter "Radar" O'Reilly

Actor: Gary Burghoff

Corporal "Radar" O’Reilly is a fictional character in the M*A*S*H novels, the film, the television series, the television pilot, W*A*L*T*E*R, and two episodes of the series, After MASH. The character was portrayed by Gary Burghoff in both the film and on television — the only actor from the film to reprise his role on television, aside from G. Wood as General Hammond.

While Radar's full name is never given in the original novel or film, on the TV series it is Walter Eugene O'Reilly. The later novels by Richard Hooker and William Butterworth give his full name as J. Robespierre O'Reilly.

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Max Klinger

Actor: Jamie Farr

Corporal (later Sergeant) Maxwell Q. Klinger is a fictional character from the M*A*S*H television series played by American actor Jamie Farr. A Lebanese-American hailing from Toledo, Ohio (like Farr himself), Klinger serves as an orderly/corpsman (and later company clerk) assigned to the 4077th Mobile Army Surgical Hospital in [usually] Uijeongbu during the Korean War. The character's original defining characteristic is his attempts to gain a Section 8 psychiatric discharge from the army, by habitually wearing women's clothing and engaging in other "crazy" stunts. He later gives up his discharge attempts and is promoted from the rank of corporal to sergeant during the course of the TV series.
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Father Mulcahy

Actor: William Christopher

Francis John Patrick Mulcahy, commonly called Father Mulcahy, is a fictional principal character from the film M*A*S*H, played by Rene Auberjonois, and the television series, played by William Christopher. He was played by George Morgan in the pilot episode of the television series, but the producers decided that a quirkier individual was needed for the role, and Christopher was cast in his place.