“Dallas” has thrown viewers for a loop with the promo for next week’s two-hour season finale, which declares, “One Ewing will die!”  Who will it be? I have no idea, but that won’t stop me from trying to figure it out. Here are three possibilities:

1. A “main” Ewing dies. In the promo, when the the looming death is announced, shots of five characters flash onto the screen: Bobby (Patrick Duffy), Sue Ellen (Linda Gray), John Ross (Josh Henderson), Christopher (Jesse Metcalfe) and Ann (Brenda Strong).

It’s hard to believe “Dallas” will kill off any of these people, each of whom brings something valuable to the series. The “safest” Ewings would seem to be Bobby and Sue Ellen, two beloved figures from the original “Dallas,” and John Ross, who’s become a fan favorite on the new show. Ann has a loyal following too, and her character offers an important link to the Rylands, who are now prominent players in the “Dallas” universe.

By my reckoning, this leaves Christopher as the likeliest candidate to die among the five Ewings shown in the promo. Losing Metcalfe would be a shame since Christopher is “Dallas’s” most upstanding character, fulfilling the role Bobby once played on the original series. (Bobby is still a hero, but now that he’s running drugs for the cartel, he’s also a little morally compromised, don’t you think?)

On the other hand: TNT’s original concept for “Dallas” — John Ross and Christopher clashing in the foreground while J.R. and Bobby battle in the background — changed after Larry Hagman died. Increasingly, the central conflict within the Ewing family is the generational struggle between John Ross and Bobby, leaving Christopher an odd man out.

So if forced to guess which one of these Ewings might head to the Big Southfork in the Sky, I’ll go with Christopher — although make no mistake: I hope it doesn’t come to that.

2. Another main character dies. What if “Dallas” plans to kill off Pamela (Julie Gonzalo)? She’s still a Ewing via her marriage to John Ross, although she made a big deal of declaring herself a Barnes in “Boxed In,” this week’s episode. If you stretch the definition of “Ewing,” another candidate emerges: Emma (Emma Bell), stepdaughter to Bobby, stepsister to Christopher and stepcousin to John Ross. That’s about as close as you can get to being a Ewing without actually being one.

Or consider this: What if there’s a come-from-out-of-nowhere revelation that Harris or Judith (Mitch Pileggi, Judith Light) are Ewing kin? Or what if Nicolas (Juan Pablo Di Pace) turns out to be a bastard son of J.R.? Don’t roll your eyes. This is “Dallas” we’re talking about.

Nevertheless, my choice among this crop of candidates is Elena (Jordana Brewster). She isn’t a Ewing, but that doesn’t mean things won’t change during the course of the two-hour season finale. Suppose Christopher and Elena have a quickie wedding, only to have the happy occasion end tragically when she’s killed by the cartel? Not only would this be a shocking twist, it would also echo one of the most memorable moments from the original show’s later years: the murder of Bobby’s bride April (Sheree J. Wilson) during their Parisian honeymoon.

And just so we’re clear: I’m not one of the “Dallas” fans clamoring for the elimination of the Ramos family. I like Brewster, although I wonder where her character can go after she waged war against the Ewings this season. If Elena has reached the end of the line, will the show get rid of her by killing her off?

3. An off-screen Ewing dies. Just because the promo suggests a Ewing will die next week, we shouldn’t assume the victim will be someone from the TNT series. What if it’s a character from the original series? There are several choices among the extended family, including Lucy, Gary, Val and Cally, as well as Ray and James, who are Ewings by blood, if not name.

Here’s one potential scenario: We lose Gary, setting up a fight between Bobby and John Ross for his portion of the Southfork mineral rights. Another possibility: Suppose Ray dies off-screen — perish the thought! — paving the way for the show to introduce an adult version of Lucas, Bobby’s son, whom Ray and Jenna raised?

Indeed, if “Dallas” is going to kill off a character from the old show, the death will have to serve the storyline on the new series. Otherwise, what’s the point?

Something else to keep in mind: I’m the guy who figured Cliff really did kill J.R. What the hell do I know?

Who do you think will die? Share your theories below and read more posts on Dallas Decoder’s “Which Ewing Dies?” page.