"Once Upon a Time" season 5 episode 11 will mark the winter finale of the show. All of the former Dark Ones will reportedly come together in Storybrooke on the upcoming episode of the fairy tale drama.

In the previous episode, viewers saw Hook (Colin O'Donoghue) corrupted by evil as he set out on a revenge mission against Rumplestiltskin (Robert Carlyle). In the end, Hook summoned all of the Dark Ones to Storybrooke.

So what could happen in the next episode?

In a video preview, Hook tells a distraught Emma (Jennifer Morrison), "You get to watch everyone you love die." This leads to the speculation that Hook brought the army of Dark Ones to Storybrooke with the main purpose of exacting revenge of her.

A lot of action is sure to transpire on the next episode, with a battle between good and evil ready to commence. However, not all of the heroes are confident in their pursuit, as Mr. Gold can be heard shouting, "This is a fight we cannot win."

With a plan so evil and an army so strong, it is almost impossible to imagine that there will be no casualties. Numerous theories about who might be killed off in the winter finale have already been circulating online. And with the trailer released, fans are in fear for Emma's life.

However, O'Donoghue has explained that Hook doesn't really want to harm or kill Emma.

"He's enveloped with the darkness and is willing to do whatever it takes to make his plan a reality. Still, deep down there's an element that they can still love that we see with Rumple still loving Belle and Emma loving Hook. But I think at this stage, he's so angry with her and hurt because she did the one thing that he begged her not to do, because he knew he couldn't fight against the darkness. He knew he didn't have the willpower to do that. So he's more of a pissed off boyfriend than wanting Emma to die in any kind of way. But at this stage, he's just so angry, and when the Dark One gets angry, you do insane things," he explains in an interview with The Hollywood Reporter.

And fans will just have to wait to see what "insane things" Hook has in store for them.

"Once Upon a Time" season 5 episode 11 will air Dec. 6 on ABC.