allas is a long-running American prime time television soap opera that aired from April 2, 1978 to May 3, 1991 on CBS. The series revolves around the a wealthy and feuding Texan family, the Ewings, who own the independent oil company Ewing Oil and the cattle-ranching land of Southfork. The series originally focused on the marriage of Bobby Ewing and Pamela Barnes, whose families were sworn enemies with each other. As the series progressed, oil tycoon J.R. Ewing grew to be the show's main character, whose schemes and dirty business became the show's trademark. When the show ended in 1991, J.R. was the only character to have appeared in every episode.

The show was famous for its cliffhangers, including the Who shot J.R.? mystery. The 1980 episode Who Done It remains the second highest rated prime-time telecast ever. The show also featured a "Dream Season", in which the entirety of the ninth season was revealed to have been a dream of Pam Ewing's. After 14 seasons, the series finale "Conundrum" aired in 1991.

The show had a relatively ensemble cast. Larry Hagman stars as greedy, scheming oil tycoon J.R. Ewing, stage/screen actress Barbara Bel Geddes as family matriarch Miss Ellie and movie Western actor Jim Davis as Ewing patriarch Jock, his last role before his death in 1981. The series won four Emmy Awards, including a 1980 Outstanding Lead Actress in a Drama Series win for Bel Geddes.

Overview from themoviedb.org