The upcoming fourth season of ABC's Once Upon a Time will heavily feature characters from Disney's massive animated hit Frozen, while also adding to their story lines.

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Among the Frozen characters expected to make the OUAT debuts in Season 4 are Elsa (Georgina Haig), Anna (Elizabeth Lail), Kristoff (Scott Michael Foster), Hans (Tyler Jacob Moore) and Pabbie the elder troll (voice of John Rhys-Davies).

By the time Season 4 of OUAT rolls around, Anna and Kristoff will be planning their wedding, according to a new TVGuide.com report.

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"In case you are wondering, the happy couple is registered at Wandering Oaken's Trading Post and Sauna," OUAT executive producers Edward Kitsis and Adam Horowitz joked to the publication.

The publication also includes the first photo of Haig as Elsa and Lail as Anna, with the latter looking like she is filled with wide-eyed idealism.

Season 4 of the fantasy series will heavily focus on the various Frozen characters, with the premiere episode being titled A Tale of Two Sisters.

Kitsis previously revealed that the period pre-Arendelle might be explored in Season 4.

"There may be some things with the parents we didn't know about pre-Arendelle," Kitsis said. Horowitz added that, "What happened to [Elsa] to get her into that urn and what was going on in her life at that point is what's going to be revealed and what's going to be pushing the story forward."

Once Upon a Time Season 4 is set to premiere Sunday, Sept. 28 at 8 p.m. on ABC.

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Once Upon A Time, Television, ABC