As the main characters of Once Upon a Time travel to Neverland for season 3, they discover the new environment has a "profound effect" on them, according to the show's co-creator.

"Neverland is a land of belief, a land of imagination, and a land where all our main characters are being stripped down to their core," show co-creator Adam Horowitz told Entertainment Weekly in a report on Thursday.

"It's really allowing us, as writers, to dig deep into who they are and to push them forward to new places," he continued. "I think being in Neverland is going to have a profound effect on each of the characters."

Fellow co-creator Edward Kitsis added that it will be interesting in season 3 to explore the relationship Emma (Jennifer Morrison) has with her parents, Mary Margaret (Ginnifer Goodwin) and David (Josh Dallas).

Once Upon a Time Season 3 Spoilers: Details on Regina's Love Interest, Tinker Bell/Hook & More

Additionally, Kitsis revealed that in episode 2, titled Lost Girl, there will be "a good old-fashioned Evil Queen versus Snow and Charming" conflict. He teased that Snow will also have a new outfit and the Queen will have a "cool Queen costume."

The co-creators also talked to TVLine on Thursday, regarding one of the most prominent new characters in season 3: Peter Pan. Horowitz revealed there is a history between Peter Pan and Mr. Gold/Rumplestiltskin (Robert Carlyle), and not a particularly pleasant one.

"There is a big reason why he [Carlyle] said if you're going to be scared of someone, this is the guy to be scared of," Horowitz explained.

Kitsis added that there is also a level of respect Rumplestiltskin has for Peter Pan.

"When you meet Pan, you're going to see a very, very, very clever person," Kitsis explained. "And if there's one thing Rumple admires, it's somebody who has game."

Once Upon a Time Season 3 Spoilers: Rufio Details & Characters Traveling to Oz?

Season 3 of Once Upon a Time premieres Sunday, Sept. 29 at 8 p.m. on ABC.

Watch the trailer for season 3 here:

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