The fourth season of "Once Upon A Time" will come back on air on September 28 featuring beloved characters from "Frozen".

Fans of the hit ABC TV series went crazy after Queen Elsa was shown in the last two minutes of the final episode of "Once Upon A Time" season 3. Right now, the show creators and executive producers Edward Kitsis and Adam Horowitz confirmed that Elsa, Anna and Kristoff will definitely appear in show next season.

However, it is most likely that fans will not see the cute snowman Olaf, which is one of the beloved characters in the Disney movie.

Adam Horowitz told Entertainment Weekly that Olaf's character will not fit the storyline. The producer added that the small screen version does not want to expand on the back story of the little snowman. 

Edward Kitsis added that they also cast Sven, Kristoff's reindeer, although it was not officially announced since, of course, a real reindeer will play the part.

According to the "Once Upon A Time" season 4 spoilers, the first half of the fourth season will be centered on the "Frozen" story arc and the events will be set after those of the film.

"What happened in the film was so beautiful. We're picking up these characters after the movie," Horowitz said in the same interview.

However, spoilers added that unlike in the movie, Queen Elsa will be back in her original state being a villain in the story. "Once Upon A Time" is known for twisting the original version of our beloved childhood fairy tales and turning the main characters into villains. Thus, it was speculated that if the next season will be based on the Disney movie, this will most likely happen.

"Once Upon a Time" season 4 is set to come back on air on September 28 at ABC.