2. Dallas, Season 9 (CBS; September 27, 1985 - May 16, 1986)
At the end of season 9 of Dallas, the writing staff made one of the strangest, most ill-advised choices in TV history.
The soap opera, which followed the exploits of a rich Texas family, continues to be one of the most celebrated in television history, and with good reason. Dallaswas home to Larry Hagman's J.R. Ewing, perhaps the most beloved villain in TV history. The show was no stranger to big season enders either, as their "Who Shot J.R.?" cliffhanger was one of the biggest events ever witnessed on the small screen.
These credentials made it all the more of a headscratcher when Bobby Ewing (Patrick Duffy), who had been thought dead, showed up in the shower at the end of the last episode, rendering numerous earlier episodes meaningless. Even Dallas couldn't totally bounce back from that. This is generally agreed upon as the show's "Jump the Shark" moment.