For what is John Clark Gable best known?

John Clark Gable has: Played himself in "Gable: The King Remembered" in 1975. Played himself in "Biography" in 1987. Played John T. Coleman in "Bad Jim" in 1990. Played Army Officer Terry in "A Burning Passion: The Margaret Mitchell Story" in 1994. Played himself in "Clark Gable: Tall, Dark and Handsome" in 1996. Performed in "Stolen Life" in 2009. Played Costello in "Sunset at Dawn" in 2014.