Cast members from the series (1972-81) are reunited for the touch-and-go nuptials of John Boy (Richard Thomas) and a diplomat's daughter. Olivia: Michael Learned. John: Ralph Waite. Janet: Kate McNeil. Ben: Eric Scott. Mary Ellen: Judy Norton. Corabeth: Ronnie Claire Edwards. Ike: Joe Conley. Grandma: Ellen Corby. Aunt Flo: Holland Taylor. Miss Emily: Mary Jackson. Miss Mamie: Helen Kleeb. Robert Ellis Miller directed.