Spinoffs, sequels and adaptions

Knots Landing

Main article: Knots Landing

Prior to Dallas' premiere, series creator David Jacobs originated the idea for a drama series about four married couples in different stages of marriage, inspired by Ingmar Bergman's Scenes from a Marriage. However, CBS wanted a "saga-like" show, resulting in Jacobs creating Dallas.^[22] When the series proved to be a hit, CBS reconsidered Jacobs's original idea, which evolved into Dallas spin-off series Knots Landing, premiering in late 1979.
Knots Landing followed the lives of Lucy's parents, Gary (Ted Shackelford) and Valene (Joan Van Ark), as they move to California to start a new life following the start of their second marriage in 1979. During the early seasons of Knots Landing, several Dallas actors (Larry Hagman, Patrick Duffy, Charlene Tilton, and Mary Crosby) made guest appearance in the new series, portraying their Dallas characters, and Shackelford and Van Ark continued to make occasional appearances in Dallas. In addition to this, some storylines crossed over, such as the reading of Jock Ewing's will, with events having an impact on characters in both shows.
The ongoing bond between the two series was eventually cut in 1986, as the tenth-season premiere of Dallas declared Bobby's death the previous year had been a dream. Bobby's death had had some influence on the Knots Landing storylines as well, with Gary grieving for his dead brother while Gary's wife Abby, who had lost her brother Sid a few years earlier, consoled him. Abby and Greg Sumner then took advantage of Gary's grief and Gary's journey to Dallas for Bobby's funeral to gain politically at Empire Valley. Val also named her and Gary's son "Bobby" in memory of his late Uncle. Unlike the Dallas producers, the Knots Landing producers were not prepared to reset their series, resulting in the Knots Landing producers cutting off their show's links with Dallas. As a result, there were no further crossover episodes or storylines. Bobby's return was simply never addressed on Knots Landing, nor was he mentioned again.
Shackelford and Van Ark did however reprise their roles for the Dallas series finale in 1991, which showed what would have happened to their characters if J.R. had never existed.

Films and reunions

A prequel story, Dallas: The Early Years, was a made-for-TV movie that first aired on March 23, 1986 on CBS during the ninth season of the TV series. The movie starred David Grant as Digger Barnes, Dale Midkiff as Jock Ewing, Molly Hagan as Miss Ellie Southworth Ewing, David Wilson as Jason Ewing, and Hoyt Axton as Aaron Southworth, and was introduced by Larry Hagman, in the role of J.R. Ewing. Detailing the origins of the Barnes-Ewing feud and the creation of Ewing Oil, and covering a timespan from 1933 to 1951, the movie was written by series creator David Jacobs.
There were also two made-for-TV reunion movies that aired on CBS several years after the series ended: Dallas: J.R. Returns (1996), which resolved the series finale cliffhanger; and the 20th anniversary movie Dallas: War of the Ewings (1998). Alongside returning series stars (Patrick Duffy, Larry Hagman, Linda Gray, George Kennedy, Ken Kercheval and Steve Kanaly), and recurring cast (Omri Katz, Audrey Landers, Deborah Rennard and George O. Petrie), the two telefilms also introduced new characters – most notably up-and-coming lawyer Anita Smithfield, played by Tracy Scoggins. The younger characters Christopher Ewing, and Cliff and Afton's daughter Pamela Rebecca were recast with Chris Demetral and Deborah Kellner taking on the roles.
On November 7, 2004, CBS aired a prime-time special entitled Dallas Reunion: The Return to Southfork, in which the stars reminisced about their work on the series (by coincidence, actor Howard Keel, who played Clayton Farlow, had died earlier that same day).
On November 8, 2008, a reunion to commemorate the show's 30th anniversary was held at Southfork Ranch in Parker, Texas, reuniting original cast members Larry Hagman, Patrick Duffy, Linda Gray, Ken Kercheval, Steve Kanaly and Charlene Tilton; other cast members in attendance were Susan Howard, Audrey Landers, Mary Crosby and Sheree J. Wilson. The front and back lawn of the fictional Ewing family home played host to a massive barbecue filled with people from the Dallas area, across the U.S. and around the world (who paid as much as $1,000) to reminisce and celebrate the series, as well as meeting with cast members. During the festivities, Kercheval said he was shocked to see the continued support for the show 17 years after it last aired: "I don't understand it. The staying power. Who knew?" Linda Gray also fondly remembered her time on the show: "I think it was a special time. It was a time when there weren't a hundred million channels and the Internet and all of the other things that came to existence."

Revival series

Main article: Dallas (2012 TV series)

In 2010, cable network TNT announced they had ordered a pilot for the continuation of the Dallas series. After viewing the completed pilot episode, TNT proceeded to order a full season of 10 episodes.
The new series premiered on June 13, 2012, centering primarily around John Ross and Christopher Ewing, the now-grown sons of J.R. and Bobby. Larry Hagman, Patrick Duffy and Linda Gray returned in full-time capacity, reprising their original roles. The series was produced by Warner Horizon Television, a subsidiary of Warner Bros., which holds the rights to the Dallas franchise through its acquisition of Lorimar Television and is a sister company to TNT, both under the ownership of Time Warner.
The new series is a continuation of the old series, with the story continuing after a 20-year break. It does not take the events of the 1990s TV movies Dallas: J.R. Returns or Dallas: War of the Ewings as canon. Instead we find the characters 20 years after the events of the Season 14 cliffhanger.^[23] In an interview with UltimateDallas.com, writer/producer Cynthia Cidre was asked to describe the new Dallas. She responded, "I tried to be really, really respectful of the original Dallas because it was really clear to me that the people who love Dallas are [like] Trekkies, really committed to that show and I really did not understand that before, so I never wanted to violate anything that had happened in the past. On the other hand that was the past, twenty years had gone by, so at the same time I think we're properly balanced between the characters of Bobby Ewing, J.R. and Sue Ellen. I also have the new cast and it's John Ross and Christopher, the children of Bobby and J.R., and their love interests. Total respect and a balance of old and new."^[24]
In the show's second season, J.R. Ewing was killed off (following the death of actor Larry Hagman in November 2012), sparking another "who-done-it" storyline throughout the remainder of the season. Various cast members from the original series attended his onscreen funeral.
Despite initially strong numbers, ratings for the new Dallas declined over the three seasons that the show ran before TNT cancelled it in 2014.

Books and other media

During the series' heyday, several magazines, books and merchandise were produced.
In 1980 a novel entitled Dallas, based on the original five-episode miniseries, written by Lee Raintree, was published by Dell Publishing. It was later followed by another three novels, adapting the subsequent seasons: "The Ewings of Dallas", "The Men of Dallas" and "The Women of Dallas", all written by Burt Hirschfeld. In 1985, Dallas: The Complete Ewing Family Saga written by Laura Van Wormer, was published, detailing the various Dallas characters and the history of Southfork ranch.
In 1980, SPI released the Dallas role-playing game.
In 1985, Dallas: The Complete Ewing Saga was published by Laura Van Wormer
In 1986/1987, further Dallas books were published. There were 14 titles in the Soaps & Serials series and Suzy Kalter wrote The Complete Book of Dallas: Behind the Scenes at the World's Favorite Television Show.
In 2004, 25 Years of Dallas: The Complete Story of the World's Favorite Prime Time Soap written by Barbara A. Curran was published by Cumberland House Publishing. It contains synopses for each season, extensive research into production and interviews with most of original cast, along with a foreword by Victoria Principal and an introduction by David Jacobs.
In 1984 Datasoft released the video game Dallas Quest, and during the 1980s the LA Times Syndicate produced a Dallas comic strip for newspapers, written by Jim Lawrence. Illustrating the strip were Ron Harris, Thomas Warkentin, Padraic Shigetani, Deryl Skelton, and others.