Spencer's Mountain stars an AMerican actor best known for playing Danny Williams in what television series?
Hawaii Five-O
Title: James MacArthur
Passage: James Gordon MacArthur (December 8, 1937 – October 28, 2010) was an American actor best known for the role of Danny "Danno" Williams, the reliable second-in-command of the fictional Hawaiian State Police squad in the long-running television series "Hawaii Five-O".
Title: Spencer's Mountain
Passage: Spencer's Mountain is an American family drama film written, directed, and produced in 1963 by Delmer Daves from a novel by Earl Hamner, Jr. The film stars Henry Fonda, Maureen O'Hara, and in early appearances in their careers, James MacArthur, Veronica Cartwright, and Victor French.  Longtime Hollywood actor Donald Crisp plays "Grandpa", his final screen role.
Title: Rusty Hamer
Passage: Russell Craig "Rusty" Hamer (February 15, 1947 – January 18, 1990) was an American stage, film and television actor.  He is best known for portraying Rusty Williams, the wise cracking son of entertainer Danny Williams (Danny Thomas), on the popular ABC/CBS situation comedy "Make Room for Daddy" (later retitled "The Danny Thomas Show"), from 1953 to 1964.  He reprised the role in three reunion specials and the sequel series, "Make Room for Granddaddy", that aired on ABC from 1970 to 1971.
Spencer's Mountain James MacArthur