Original premise

Dallas debuted on April 2, 1978, as a five-part miniseries on the CBS network. Producers initially had no plans for expansion; however, due to the show's popularity, it was subsequently turned into a regular series and broadcast for 13 full seasons, from September 23, 1978, to May 3, 1991. The first five episodes, originally considered a miniseries, are now referred to as season one—making fourteen seasons in total.
The show is known for its portrayal of wealth, sex, intrigue, and power struggles. Throughout the series, the main premise is the longtime rivalry between the Ewings and the Barneses which came to head when the Barneses' daughter Pamela (Victoria Principal) eloped with a Ewing son, Bobby (Patrick Duffy), in the first episode.

The Southfork Ranch, home of the Ewing family

The back story was that, in the 1930s, wildcatter John Ross "Jock" Ewing, Sr. (Jim Davis) had allegedly cheated his one-time partner, Willard "Digger" Barnes (David Wayne and later Keenan Wynn), out of his share of their company Ewing Oil, and married Digger's only love, Eleanor "Miss Ellie" Southworth (Barbara Bel Geddes). Ellie's family were—in contrast to Jock—ranchers, with great love for the land and the cattle. Following the marriage of Ellie and Jock, the Southworth family ranch, Southfork, became the Ewings' home, where Jock and Miss Ellie raised three sons: J.R. (Larry Hagman), Gary (Ted Shackelford) and Bobby.
J.R., the eldest Ewing son, unscrupulous and unhappily married to a former Miss Texas, Sue Ellen Shepard (Linda Gray), was frequently at odds with his youngest brother, Bobby, who had the morals and integrity that J.R. lacked. Middle son Gary was Ellie's favorite as he displayed Southworth traits; however, Gary had been in conflict with both Jock and J.R. since childhood and was dismissed as a weak link. While still young, Gary had married waitress Valene Clements (guest star Joan Van Ark), who produced the first heir, the petite and saucy Lucy (Charlene Tilton). Years prior to the series beginning, J.R. had driven Gary and Valene off Southfork, leaving Lucy to be raised by her grandparents.
During the first episodes of the series, the teenaged Lucy (Jock Ewing's granddaughter) is seen sleeping with ranch foreman Ray Krebbs (Steve Kanaly). Later, in season four, Ray would be revealed as Lucy's uncle, an illegitimate Ewing son through an extramarital affair that Jock Ewing had during World War II. Unhappy with his small, one-dimensional role, Kanaly had considered leaving the show; to add depth to the Ray character, Hagman suggested that the writers create a plot wherein Ray becomes half-brother to J.R., Gary, and Bobby, noting his resemblance to Davis. The episodes where Ray and his niece Lucy had a fling is, as Kanaly told Dinah Shore in an appearance on her show, "prayerfully forgotten, I hope".
Ray had previously engaged in a short fling with Pamela Barnes, the daughter of Digger Barnes (although it was later revealed that Pam was not Digger's biological daughter). However, Pam fell deeply in love with Bobby, and the pilot episode begins with the two of them arriving at Southfork Ranch as newlyweds, shocking the entire family. J.R., who loathed the Barnes family, was not happy with Pam's living at Southfork, and constantly tried to undermine her marriage to Bobby. Meanwhile, Pam's brother Cliff (Ken Kercheval), who had inherited Digger's hatred towards the Ewings, shared J.R.'s objections to the marriage, and continued his father's quest to get revenge.
Most of the seasons ended with ratings-grabbing cliffhangers,^[5] the most notable being the season three finale "A House Divided", which launched the landmark "Who shot J.R.?" storyline and was ranked #69 on TV Guide's list of "TV's Top 100 Episodes of All Time".^[6] Other season finale cliffhangers include the finding of an unidentified floating female corpse in the Southfork swimming pool (season four); a blazing house fire (season six); and Bobby's death (season eight) and subsequent return (season nine).