'Once Upon a Time' season 6 spoilers: Regina knows of a way to defeat evil alter ego?

(Facebook/OnceABC)Regina faces off with the Evil Queen in "Once Upon a Time" season 6.

Regina (Lana Parrilla) and her evil alter ego will have a lot of debts to settle with each other in the upcoming season of "Once Upon a Time."

Last installment, Regina took a huge step to eliminate the Evil Queen residing inside her. She took Dr. Jekyll's (Hank Harris) serum and used it to get her other self out and rip her heart. To her surprise, the Evil Queen lived and declared war against her. Her evil alter ego was very disappointed with what she has become. For the Evil Queen, Regina has become soft and she is determined to teach her a lesson.

Executive producer Edward Kitsis told Entertainment Weekly that the villain would show Regina what "ripping away everyone's happy ending truly looks like."

The showrunner also hinted that it would be quite impossible to kill off the Evil Queen. After all, she and Regina were one and there are still a lot of questions on how separating parts of oneself really works. Kitsis alluded that what would happen to them is akin to the events that took place for Jekyll and Hyde (Sam Witwer). He also shared that they hope to focus on this complicated circumstance in the upcoming season. Does it mean that Regina must sacrifice herself to end the Evil Queen's reign? Will she have to die for the other to perish as well?

Meanwhile, EP Adam Horowitz shared in an interview that they would be digging deep to the psyche of the characters to show the viewers a new side of the story. He said that the Land of Untold Stories would make this possible, as it would provide "a new venue" for the Storybrooke heroes to bloom and change right in front of the viewers' eyes. After five long seasons, he said it was time for a change.

"The intent is that these new characters and new stories are really a reflection on what's going on inside of our characters. With Lana and the Evil Queen, that's the starkest example, which we've already teased. We're literally going inside her and pulling her apart. There are elements of that that we're planning to do for each and everyone of the characters," he said.

"Once Upon A Time" season 6 will air September 25, Sunday, on ABC on the 8 p.m. time slot.

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