'Once Upon A Time' season 4 spoilers: Queen Elsa vs. Evil Queen Regina

Once Upon A Time season 4Facebook/OnceABC

Only one evil queen should reign over Storybrooke, and the arrival of Arendelle's Queen Elsa poses a threat to Regina's title as the villainous queen in this part of the town.

In the latest extended trailer for the upcoming fourth season of "Once Upon A Time," fans can see Elsa (Georgina Haig) declaring that she is the queen.  This rings like a bad note in the ears of Regina (Lana Parrilla).  This, plus the fact that she is heartbroken, brings the evil queen Regina back to her former wicked ways.

So, she enlists the help of her old pal, the Mirror, to help her scare away the ice queen.

"She needs to be removed," Regina proclaims. It is still unknown what she will pull out her bag of tricks to eliminate Elsa. However, fans can bet on some magical action between the two.

The two queens have so much things in common, including their back-stories of love and loss as well as their desire for power. Thus, the audience can expect an intense struggle for supremacy between the two queens.

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

Meanwhile, Regina will be back to her former self after her 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 this month, and will feature the 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.

"Once Upon a Time" season 4 returns to ABC on Sept. 28 at 8 p.m.