Last night, we got some new, spoilery intel for ABC's upcoming "Once Upon A Time" Winter finale episode 10 of season 6, via a small teaser description and the new promo/spoiler clip (below). The description sounds really interesting, implying that the course of fairytales could be altered forever! The past could be changed, and that somebody needs to be careful about what wishes they choose to make.

Some bad wishing takes place

The name for this latest installment, is: "Wish You Were Here," so it seems to flow right in line with some of the events of what part of the storyline that we do know. ABC hasn't served up the press release that reveals the large synopsis yet, so we're going to have to settle for this short, teaser description instead.

It reveals that someone or a couple of people need to be a little bit more careful about the wishes they make, because they could actually cause major changes to the past and thereby create a permanent change in the direction of fairy tales!

The Evil Queen has done it again

Then, of course, we've got this promo clip that reveals a lot more details of what will be happening. We see, at one point, Emma is spotted, wishing that she had never become the savior, and that turns out to be a really big mistake as the vicious Evil Queen is later spotted, wishing that Emma's wish be granted!

Where and who is she?

After that, Emma suddenly disappears. Then we see a scene that features Regina, walking up to Emma, who is now sporting a white outfit and acting really strange. Regina tries to ask her, what in the hell happened to her, but it doesn't look like she's going to get a reply from this version of Emma.

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Maybe she will. Who knows? We'll have to wait and see, because the clip quickly takes us to another scene before we can see what alternate Emma does.

Wishes can't be undone

In the next scene, we see the Evil Queen, telling Charming something that's extremely important, which is you can't undo wishes. If that actually is true, our dear Emma could be lost forever! Oh no! The clip caps off with Charming, forgetting that he's just a mere mortal and tries to attack the EQ. Needless to say, she quickly reminds him that he doesn't really stand a chance against her powerful magic. So, yes that is quite a revealing clip. Be sure to check it out.

We can confirm that episode 10 is set to air on Sunday night, December 4th at 7pm central time, so be sure to jot that date down on your TV itinerary and stay tuned.