Knots Landing
The "Dallas" spin-off series "Knots Landing" premiered in December 1979, and throughout the season, three "Knots Landing" episodes featured "Dallas" characters: Bobby (Patrick Duffy) appeared in "Pilot" (airing on December 27, 1979); J.R. (Larry Hagman) in "Community Spirit" (January 3, 1980); and Lucy (Charlene Tilton) in "Home is for the Healing" (January 31, 1980, her only "Knots Landing" appearance).