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Gary Richard Burghoff (born May 24, 1943) is an American actor, known for playing the character Corporal Walter Eugene "Radar" O'Reilly in the MASH series and Charlie Brown in the 1967 Off-Broadway musical You're a Good Man, Charlie Brown. Description above from the Wikipedia article Gary Burghoff, licensed under CC-BY-SA, full list of contributors on Wikipedia.

M*A*S*H: The Comedy That Changed Television
as Self
The Real M*A*S*H
as Himself

Daniel's Lot
as Pastor Mahoney

M*A*S*H: 30th Anniversary Reunion
as Himself
Enlisted: The Story of 'M*A*S*H'
as Self

Altman on His Own Terms
as Self
Pets: Part of the Family

Hollywood Squares
as Self - Panelist

Behind the Waterfall
as Mr. Connors

Burke's Law
as Patrick Noyes

Small Kill
as Fleck / Lady Esmerelda

Memories of M*A*S*H
as Self / Radar O'Reilly

W*A*L*T*E*R
as Walter 'Radar' O'Reilly

AfterMASH
as Radar O'Reilly
Making 'M*A*S*H'
as Self

Casino
as Bill Taylor

The Man in the Santa Claus Suit
as Bob Willis

Tales of the Unexpected
as Harry Flock
$weepstake$
as Roscoe Fuller

Fantasy Island
as Richard C. Delaney

The Love Boat
as Donald Flanders

CHiPs
as Gary Burghoff (uncredited)

Donny & Marie
as Self

Wonder Woman
as Alan

Twigs
as The Priest

Dinah!
as Self

M*A*S*H
as Radar O'Reilly

B.S. I Love You
as Ted

M*A*S*H
as Cpl. 'Radar' O'Reilly

The Good Guys

The Merv Griffin Show
as Self