Larry Hagman (Albert Miller) played J.R. Ewing on Dallas (1978) while Donna Mills (Jane Miller) played his sometime sister-in-law Abby Cunningham Ewing Sumner in its spin-off Knots Landing (1979). Furthermore, David Wayne (Charles Dutton) played Jock Ewing's rival Willard "Digger" Barnes in four episodes of Dallas (1978).
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