"Once Upon A Time" Season 4 spoilers reveal the atmosphere between Emma Swan (Jennifer Morrison) and the Evil Queen (Lana Parrilla) in the next chapter of the ABC fantasy drama. In an interview, the actresses portraying the two intertwined roles said what happens next is a show of understanding. Meanwhile, "Frozen" characters Elsa and Anna were shown to the San Diego Comic Con attendees.

Spoiler alert: This feature contains Once Upon A Time Season 4 spoilers. Read at your own risk.

Speaking to TVLine's Michael Ausiello (watch the video here), Morrison and Parrilla said they were surprised to know that Swan and Regina would not be at each other's throat in Once Upon A Time Season 4. The evil queen understands that Marian coming back to Storybrooke was a mistake, said Parrilla.

Summing up Regina's journey throughout Once Upon A Time, Parrilla also said Regina has come a long way from being the "badass Evil Queen" to "realising her potential to love someone," to "meeting her true love." Digital Spy further quoted her as saying, "I'm proud of [Regina's] growth."

Josh Dallas (Prince Charming), Colin O'Donoghue (Captain Hook), and Jared S. Gilmore (Henry) were also in the same TVLine interview. Everyone wouldn't reveal anything about the mystery role of "Lost" alum Elizabeth Mitchell in the Frozen arc in Once Upon A Time Season 4. But they did dish that Hook, aka Killian, would be wearing lighter clothing that fans might love.

"Did Henry see Frozen in New York?" Ausiello asked. Everyone agreed it is worth taking up with the producers.

The San Diego Comic Con attendees were treated to a sneak peek into the timeline of Queen Elsa (Georgina Haig) and Princess Anna (Elizabeth Lail). It has been confirmed that Once Upon A Time Season 4 will show what happens next to the Arendelle sisters after the events in Disney's "Frozen" movie. There will be a wedding.

"It's for your wedding!" Queen Elsa tells Anna about a "surprise" in the Once Upon A Time Season 4 preview at the SDCC. Scott Michael Foster is playing Kristoff, presumed to be the man Princess Anna would marry in OUAT 4.

OUAT show runners Edward Kitsis and Adam Horowitz were also at the SDCC panel. Emilie de Ravin and Robert Carlyle were also present, together with the others interviewed by TVLine. (Oncers ship the characters as Rumbelle.) Ginnifer Goodwin showed in a "live" Skype video, saying she was in Vancouver, filming Mary Margaret/Snow White scenes at the time.

WATCH: Once Upon A Time Season 4 Teaser at SDCC (Highlights of OUAT 3)

[Source]

Once Upon A Time Season 4 premieres on ABC on Sept. 28, Sunday.

Related TV Stories, Episode Guides and Spoilers

Once Upon A Time Season 4 Updates: Queen Elsa as Villain Explained, Teasers from New Dad Josh Dallas, Burning Questions [SPOILERS]
Once Upon A Time Season 4 Premiere Date Set, Queen Elsa in Costume Spotted; OUAT 4x01 Title Revealed, Mystery Frozen Cast Announced [SPOILERS]
Arrow Season 3 Trailer Spoilers, Review: Comic-con Preview Reveals Olicity Incident, Arsenal Costume, Black Canary's Return, and More Developments [Watch Arrow 3 Promo Video]