Millions tune in to find out who shot J.R. On this day in 1980, 350 million people around the world tune in to television’s popular primetime drama “Dallas” to find out who shot J.R. Ewing, the character fans loved to hate. J.R. had been shot on the season-ending episode the previous March 21, which now stands as one of television’s most famous cliffhangers. The plot twist inspired widespread media coverage and left America wondering “Who shot J.R.?” for the next eight months. The November 21 episode solved the mystery, identifying Kristin Shepard, J.R.’s wife’s sister and his former mistress, as the culprit. The CBS television network debuted the first five-episode pilot season of “Dallas” in 1978; it went on to run for another 12 full-length seasons. The first show of its kind, “Dallas” was dubbed a “primetime soap opera” for its serial plots and dramatic tales of moral excess. The show revolved around the relations of two Texas oil families: the wealthy, successful Ewing family and the perpetually down-on-their-luck Barnes family. The families’ patriarchs, Jock Ewing and Digger Barnes, were former partners locked in a years-long feud over oil fields Barnes claimed had been stolen by Ewing. Ewing’s youngest son Bobby (Patrick Duffy) and Barnes’ daughter Pam (Victoria Principal) had married, linking the battling clans even more closely. The character of J.R. Ewing, Bobby’s oldest brother and a greedy, conniving, womanizing scoundrel, was played by Larry Hagman. As J.R. had many enemies, audiences were hard-pressed to guess who was responsible for his attempted murder. That summer, the question “Who Shot J.R.?” entered the national lexicon, becoming a popular t-shirt slogan, and heightening anticipation of the soap’s third season, which was to air in the fall. After a much-talked-about contract dispute with Hagman was finally settled, the season was delayed because of a Screen Actors Guild strike, much to the dismay of “Dallas” fans. When it finally aired, the episode revealing J.R.’s shooter became one of television’s most watched shows, with an audience of 83 million people in the U.S. alone—a full 76 percent of all U.S. televisions on that night were tuned in—and helped put “Dallas” into greater worldwide circulation. It also popularized the use of the cliffhanger by television writers. The shooting of J.R. wasn’t “Dallas'”only notorious plot twist. In September 1986, fans learned that the entire previous season, in which main character Bobby Ewing had died, was merely a dream of Pam’s. The show’s writers had killed the Bobby character off because Duffy had decided to leave the show. When he agreed to return, they featured him stepping out of the shower on the season-ending cliffhanger, and then were forced the next season to explain his sudden reappearance. The last premiere episode of “Dallas” aired on May 3, 1991. A spin-off, “Knots Landing,” aired from December 27, 1979 until May 13, 1993. “Dallas” remains in syndication around the world. 1916 Britannic sinks in Aegean Sea The Britannic, sister ship to the Titanic, sinks in the Aegean Sea on this day in 1916, killing 30 people. More than 1,000 others were rescued. In the wake of the Titanic disaster on April 14, 1912, the White Star Line made several modifications in the construction of its already-planned sister ship. First, the name was changed from Gigantic to Britannic (probably because it seemed more humble) and the design of the hull was altered to make it less vulnerable to icebergs. In addition, it was mandated that there be enough lifeboats on board to accommodate all passengers, which had not been the case with the Titanic. The nearly 50,000-ton luxury vessel, the largest in the world, was launched in 1914, but was requisitioned soon afterward by the British government to serve as a hospital ship during World War I. In this capacity, Captain Charlie Bartlett led the Britannic on five successful voyages bringing wounded British troops back to England from various ports around the world. On November 21, the Britannic was on its way to pick up more wounded soldiers near the Gulf of Athens, when at 8:12 a.m., a violent explosion rocked the ship. Captain Bartlett ordered the closure of the watertight doors and sent out a distress signal. However, the blast had already managed to flood six whole compartments—even more extensive damage than that which had sunk the Titanic. Still, the Britannic had been prepared for such a disaster and would have stayed afloat except for two critical matters. First, Captain Bartlett decided to try to run the Britannic aground on the nearby island of Kea. This might have been successful, but, earlier, the ship’s nursing staff had opened the portholes to air out the sick wards. Water poured in through the portholes as the Britannic headed toward Kea. Second, the disaster was compounded when some of the crew attempted to launch lifeboats without orders. Since the ship was still moving as fast as it could, the boats were sucked into the propellers, killing those on board. Less than 30 minutes later, Bartlett realized that the ship was going to sink and ordered it abandoned. The lifeboats were launched and even though the Britannic sank at 9:07, less than an hour after the explosion, nearly 1,100 people managed to make it off the ship. In fact, most of the 30 people who died were in the prematurely launched lifeboats. In 1976, famed ocean explorer Jacques Cousteau found the Britannic lying on its side 400 feet below the surface of the Aegean. The cause of the explosion remains unknown, but many believe that the Britannic hit a mine.