What was the most shocking turn on series TV? [LOTS OF OPEN SPOILERS -- edited title]

On Scrubs: The episode “One in Three”, which starts out by saying that, with the exception of a few departments, one in three patients that enters a hospital won’t leave alive. Three patients are featured…and they all die.

On Doctor Who: The Doctor-Donna is revealed. At that point, I thought the Sontarans (one of their planets had been stolen) were going to attack the Dalek fleet, enabling the Doctor to save the day but only with the help of a villain. The real solution was so much better.

But most of all (other than anything already mentioned)…

On Buffy the Vampire Slayer: When Buffy asks the apparent assassin who just attacked her who she is. “I am Kendra, the Vampire Slayer!” I can still remember looking at my husband. We simultaneously said, “Huh? Oh!”

On WCW television —the 1996 Bash at the Beach where Hulk Hogan is revealed to be the third member of the Outsiders(Scott Hall and Kevin Nash) and turns heel on the crowd----cutting a promo renaming the group New World Order (NWO).

It was shocking because Hogan had been a face(good guy) since he won the WWF title in 1984 for the first time. Turning bad reinvigorated Hogan’s career and WCW became the hot promotion over WWF for a few years.

Thinking back as long as I have watched TV, the biggest were likely:

Locke is revealed to be in a wheelchair - LOST

Bent-Neck lady, which I won’t reveal the twist aspect - Haunting Of Hill House

The Red Wedding on Game of Thrones(though I had read the book and kind of knew)

Mr. Robot’s ending, which I will not reveal, but loved. - Mr. Robot

I just saw an episode of ER very late in the series where John Carter returns and it is revealed he is getting chemo or dialysis. Alone, and looking very sad.

Diana Muldaur also played two different roles on The Original Series.

The finale of HOW I MET YOUR MOTHER could be summed up as ‘and that, kids, is the story of how I met your mother, who, as you know, is now dead.’

(Or, to quote said kid: “No, this is a story about how you’re totally in love with Aunt Robin — and you’re thinking about asking her out, and you want to know if we’re okay with it.”)

I never watched that show, and I’m glad.

Wasn’t it even worse? Umpty-years of the show, and the mother shows up in the last episode, never seen before?

No, the mother showed up in several episodes of the last season - that’s kind of why people are mad about her fate - because the show was able to introduce a new character in thd last season who was appealing and fit in well with the rest of the characters

Thanks! I was going by what I read.

“Your Mother died on the way back to her home planet”

Even funnier would have been a scene where Dr. Pulaski is waiting for a turbolift, it arrives, and Pulaski starts to get in- then checks herself, looks at the interior of the lift as if to reassure herself that all is well, then gets in.

For the most shockingly hilarious surprise, yes!

No problem- it’s an understandable error

I just checked IMDB and she showed up in 14 episodes (more than I thought) (and is credited in a few more that she wasn’t actually shown in). Here’s a scene from the episode that’s entirely about her

“Oh, you are the guy who ordered those wedding invitations. How did it all work out?”

George: “No complaints.”

Babylon 5:
“Kosh,you know what’s at stake. If you’re going to do anything, you must do it now!”

Pretty sure that that was the series finale. That episode brought back a lot of the original cast but did it in a way that didn’t have them all on screen together. Dr. Carter had kidney failure and Dr. Benton was the one who performed the surgery to give him a new kidney. Dr. Ross and Nurse Hathaway are together and somehow are involved in getting him the kidney. However, they don’t know who it is for. Just “some doctor”. I only remember because it was the first episode that I had watched in years. I quit after all of the Dr. Romano drama that is referenced above.

I just watched the series finale - again - this morning. Carter got his kidney a couple episodes before that. Benton didn’t perform the surgery, though - he invited himself into the operating room to make sure all went well.

In the TV series Alias, it is revealed after a season or two that the “good guys” have been working for the bad guys all along.

Or when you see your own username and think, “I don’t remember posting that…”, then realize you did so nine years ago.

“Holy gee! That’s Paul. They blew him up in his car!”

(From the All In The Family episode that begins with Archie discovering a swastika spray-painted on his door.)