Fans attending New York Comic Con got treated at the Once Upon a Time panel to a screening of this Sunday's coming episode, "Rocky Road." The episode dives further into the show's new incorporation of Frozen characters and brings in a new big bad (played by Elizabeth Mitchell) for the heroes of Storybrooke to be worried about, focusing on some of Elsa's backstory and what that means for everyone else in present day.

Elsa and Kristoff do some serious scene stealing as their relationship develops more but they're not the only pair that has intense and emotional moments in episode three. Emma is struggling with her past relationships and what that means for her future with Hook, while Regina and Hood are forced to spend some quality time together and Mr. Gold just may be keeping another secret from Belle.Snow is struggling with a relationship as well, although hers may be a bit different as she's trying to balance her busy new life as the mayor and her fear of being away from her baby. The show may be taking on new twists and turns with their Frozen storyline, but "Rocky Road" pays good attention to all involved characters, new and old and shows just how well the storyline will begin to come together for the rest of the season, setting the stage for interesting questions and conflict to come.Following the screening there was a brief panel with Jennifer Morrison, Edward Kitsis, and Adam Horowitz where they discussed where the Frozen storyline is going, Emma's relationship to Hook, and also her relationship with Regina, as well as upcoming important story lines. According to Kitsis, Hook is "going to be inspired by Emma" and the pair have their "first proper date" coming up.Fans of Regina can also look forward to seeing the evil queen make some more changes. As the new episode shows her taking on an operation with Henry that the pair have dubbed Operation Mongoose. "Operation Mongoose is going to be a big story," Kitsis teased. On top of that, the show creators paid tribute to Emma's dedication to proving herself to be a friend to Regina. "Emma has to give everyone their happy ending," said Horotwiz. "Including Regina."Getting some upcoming focus of her own, Belle's mother will be making an appearance soon and the creators explain that viewers will get to see Belle before what they know of her now and learn to understand how she became a hero.Although lips are tight surrounding the remainder of the Frozen storyline and the arc it'll bring to the season, Horowitz says that the show is incorporating much of its own mythology into the Frozen tale. Despite that, the characters are all quite similar to the movie. "We just want to be true to these characters," he explained, noting how they purposely made the snow monster and the rock trolls as close to the film characters as possible. The incorporation of Once Upon a Time's own mythology though will show what Elsa and her magic are exactly in Storybrooke (and in our modern day world), and what trials that will present.