The inclusion of Disney's Frozen has proven to be a success for ABC's Once Upon a Time, so will the arc continue into the second half of season 4?

'Once Upon a Time' Spoilers: Emma & Others Facing 'Turmoil' As Evil 'Descends' Upon Storybrooke

Everything is set to come to a head in these final episodes of the first half of the season, but that doesn't mean Frozen will be done for good. In fact, there is a twist coming that may have something to do with Elsa (Georgina Haig), Anna (Elizabeth Lail) and other Frozen characters.

As Once Upon a Time co-creator Adam Horowitz told TVGuide.com, everything is "headed toward a collision in our winter finale," particularly involving Elsa in Storybrooke and Anna in Arendelle.

'Once Upon a Time': Spell Of Shattered Sight Curse Might Have Huge Effect On Regina

Fellow co-creator Edward Kitsis said that while the Snow Queen (Elizabeth Mitchell) and her storyline will be handled, this also spins off an interesting twist.

"The arc will come to an end and the Snow Queen is dealt with, but something surprising rears its head in the aftermath of this story, and it takes us right into our next arc," Kitsis said. "It's our favorite twist yet."

Does this have something to do with the inclusion of multiple female villains? Iconic Disney villains like Maleficent (Kristen Bauer van Straten), Cruella De Vil (Victoria Smurfit) and Ursula (Merrin Dungey) are all slated to star in the second half of the season. The twist is set to be revealed in the winter finale on Sunday, Dec. 14.

Once Upon a Time airs Sundays at 8 p.m. ET/PT on ABC.

Watch the trailer for the next episode of Once Upon a Time here:

Tags: Once Upon A Time television ABC