"Robert Wightman is an American actor perhaps best known for replacing Richard Thomas in the role of \"John-Boy Walton\" in the TV series The Waltons. He played the role beginning with the show's eighth season in 1979 until the end of the series in 1981. He also appeared in the role in the TV movie A Day of Thanks on Walton's Mountain in 1982."@en . "Wightman, Robert"@en . "Actor" .