text: Jack Ewing left Dallas to continue his travels and get away from J.R., midway through season 10, and returned a final time for two episodes towards the end of the season. While there has been no official reason as to why actor Dack Rambo was written out of Dallas, Rambo himself later stated that he believed the reasons to be his bisexuality or his conflicts with Larry Hagman, which Rambo said had particularly intensified during his last season on the show (season 10). Before Dallas, Rambo and Hagman had worked together on Sword of Justice in the late 1970s. Hagman later denied any involvement in Rambo's dismissal from Dallas.
  Pamela was severely burned after driving a car into an oil tanker, which then exploded into flames, in the season 10 finale in 1987. During season 11, Pam disappeared after her half-sister Katherine was seen around the hospital, with Pam seemingly leaving Bobby and Christopher due to her unwillingness to let them see her in such a physically disfigured fashion. While Victoria Principal never returned to Dallas again after the season 10 finale, Margaret Michaels, a Principal look-alike, played Pam in the opening episode of season 12. Having undergone plastic surgery which explained the difference in her appearance, it was revealed that Pam was dying of a disease, though only she and her doctor knew about this. After this episode, Pam is never seen again. Unable to reach a salary agreement and having a desire to start her own business, it was Principal's own decision not to return to the show after the season 10 finale.