What's an episode of "Star Trek"--any series--that had you on on the edge of your seat, trying to guess what was going on, only for the answer to be a complete let-down?
For me personally though, the most infuriating cop-out ending to an episode is TNG's "Remember Me." One by one, people on the Enterprise are vanishing out of existence, and out of all history, as if they had never been there. Dr. Crusher is the only one that seems to notice this, while everyone else insists that the missing people never existed, and Crusher is off her rocker. Crusher eventually concludes that the entire universe might be shrinking! And then..........it turns out she's just in a fake balloon universe that's deflating. My interest also deflated.
"Frame of Mind" (TNG): Riker keeps shifting between his life on the Enterprise, and being a mental patient in an alien asylums. As he tries to figure out which life is real, we the audience try to figure out what's causing the duel realities. Has Riker's consciousness been merged somehow with someone else's? Is he simply shifting between universes? Nope. Turns out...some bad guys kidnapped him and put him to sleep, and both realities are just his dreaming brain trying to kill time for an hour until 5 minutes before the credits roll.
"Future Imperfect:" (TNG) Riker has a knack for finding himself in intriguing mysterious realities, that turn out to be lame gaslights by lame aliens. In this one, he seemingly awakens 15 years into the future, having suffered some kind of amnesia that erased the last 15 years of his memory. He tries to adjust to being captain of the Enterprise, having a son named Jean-Luc (even though Jean-Luc Picard is still alive), Jean-Luc the First sporting a ludicrous billy-goat beard, and Geordie having normal eyes. After realizing things don't add up, Riker demands that this trickery end. Then, seemingly, it turns out to be a holo-program, controlled by Romulans! But for what purpose? And then...........the Romulans are fake too. Turns out, it was all one big hallucination caused by a lonely bug alien, who didn't want Riker to leave him friendless again. Riker cheerfully tells the alien that they can totally be bestest-best friends for the next 3 minutes until the credits roll, after which the bug-boy is never mentioned again.
What are some episodes that you felt began very intriguing, and had terrible cop-out endings?