The actors of the original "Dallas" television series were Barbara Bel Geddes, Jim Davis, Patrick Duffy, Larry Hagman and Victoria Principal. These actors all starred in the first season of the show. The original "Dallas" aired from 1978 to 1991 and featured 21 regular cast members during that time.
Bel Geddes and Davis played the matriarch and patriarch of the Ewings, a wealthy Texas family. Hagman and Duffy were their sons, J.R. and Bobby, respectively. David Ackroyd played a third son, Gary, who made few appearance on the show. Instead, the character served as inspiration for the spin-off series "Knots Landing."
Other main characters on "Dallas" were J.R.'s wife Sue Ellen and Bobby's wife Pam. Victoria Principal played Pam and Linda Grey played Sue Ellen. Principal was a regular cast member in the first season, while Grey had a recurring role. Grey became a regular cast member in the second season.
Hagman was the only cast member who remained with the show throughout its run. Duffy opted to leave the show at the end of the eighth season, and the writers killed off his character. However, Duffy returned to the show in its tenth season, with the explanation that Pam dreamed season nine.
Other actors who were regular cast members of the original "Dallas" included Ken Kercheval, Charlene Tilton, Howard Keel and George Kennedy.