"Once Upon a Time' co-creator Adam Horowitz recently took to social media to give his followers a sneak peek at the title for the second episode in the upcoming new season.

"Here's another #OnceUponATime #titlespoiler. Hope to see ya 9/28 for Season 4," tweeted Horowitz over the weekend.

The accompanying photo that Horowitz posted was of the front page of the Season 4, Episode 2 script. Underneath the show's logo is the title of the episode, "White Out."

No other information was given regarding the episode's plot, but the photo shows that the script was written by Jane Espenson, a consulting producer and writer for the ABC series. She has also worked on other popular TV shows such as "Buffy the Vampire Slayer', "Gilmore Girls', and "Dollhouse'.

Fans are speculating that "White Out" will have something to do about the recent additions to the "Once Upon a Time' universe, specifically, the 'Frozen' characters. It can be recalled that the last scene of Season three's finale showed Elsa, making her way to Storybrooke. Somehow, the Queen of Arendelle was trapped in an urn in Rumpelstiltskin's dungeon in the Enchanted Forest of the Past, and was set free when the urn was broken.

Recently, lucky fans at Comic-Con were treated to a sneak preview of the show's fourth season through a short clip. In the clip, Anna (Elizabeth Lail) and Elsa (Georgina Haig) are seen laying flowers at their parents' graves. Elsa told Anna that she has a surprise for her wedding. Viewers are now guessing that the wedding of Anna and Kristoff (Scott Michael Foster) will be seen on screen.

Meanwhile, "Lost' alum Elizabeth Mitchell was recently added to the cast in early July. Though the cast and crew is keeping quiet about her role, Entertainment Weekly reported that the role is allegedly linked to "Frozen' and could be "villainous."

"Once Upon a Time' Season 4 will air on Sept. 28 on ABC.