"Once Upon a Time" co-creator Adam Horowitz recently tweeted the titles of three episodes in season 4, which hinted the plot of the said episodes.

The first episode is entitled "A Tale of Two Sisters". The first episode will most likely feature the two sisters – Elsa and Anna. The episode could possibly show a back story of the sisters just like in the opening of the movie "Frozen". There were speculations that the first episode will also expand on the reason why the sisters ended up in Storybrooke and what the other characters plan to do.

The second episode is called "White Out." Predictions claimed that the second episode may have something to do with the winter mode in the movie triggered by Elsa which caused her departure from the kingdom.

Lastly, the third episode is named "Rocky Road," which suggests a dilemma for the characters of the series. Moreover, it could signal the onset of Anna's expedition in finding her sister who ran away after she enveloped her kingdom in snow.

"Once Upon A Time" spoilers claimed that Queen Elsa will be back in her original state being a villain in the story of the "Snow Queen". The TV series is known for twisting the original version of our beloved childhood fairy tales and turning the main characters into villains. However, show runners affirmed that the TV version will follow Disney's movie.

Meanwhile, the main characters have to deal with their own issues. Regina's heart was broken last season when Emma brought Robin Hood's wife from the past to the present.

The fourth season of "Once Upon A Time" will come back on air on September 28 featuring beloved characters in "Frozen". The show creators and executive producers Edward Kitsis and Adam Horowitz confirmed that Elsa, Anna and Kristoff will definitely appear in show next season.