• (L-R) Actors Jared Gilmore, producer Edward Kitsis, Lana Parrilla, Emilie de Ravin, Colin O'Donoghue, Rebecca Mader, Josh Dallas and Adam Horowitz attend 'Once Upon A Time' Press Line Comic-Con International 2016 at Hilton Bayfront on July 23, 2016 in San

(L-R) Actors Jared Gilmore, producer Edward Kitsis, Lana Parrilla, Emilie de Ravin, Colin O'Donoghue, Rebecca Mader, Josh Dallas and Adam Horowitz attend 'Once Upon A Time' Press Line Comic-Con International 2016 at Hilton Bayfront on July 23, 2016 in San (Photo : (Photo by Frazer Harrison/Getty Images))

"Once Upon a Time" (OUAT) Season 6 premieres Sept. 25, Sunday. Episode 1 is titled "The Saviour" and it will see the heroes' journey to the Land of Untold Stories. Meanwhile, the Storybrooke residents will come face to face with a new enemy. Here are the detailed spoilers for the next chapter of the series. Read on to find out what happens next. Also, find out where to watch the premiere online via live stream for free.

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[Spoiler alert! This article contains spoilers for "Once Upon a Time" (OUAT) Season 6 premiere (episode 1) "The Saviour." Do not read further if you don't wish to know more about it.]

"Once Upon a Time" (OUAT) Season 6 opens with episode 1 fans must brace themselves for an eventful premiere. The villains will reappear, Emma will deal with a mysterious problem, and Storybrooke will be invaded by the people from the Land of Untold Stories.

ABC has released a detailed synopsis for "Once Upon a Time" (OUAT) Season 6 episode 1. According to the description of the network's official website, the heroes have a deadly face off with a new villain. Meanwhile, Emma has an epiphany. She finally figures the meaning of being "The Saviour." And while trying to break Belle's sleeping curse, Rumple enters Belle's dreamscape. He takes the help of a stranger in order to bring Belle back to consciousness.

At the same time, the heroes come together to stop Mr. Hyde. Meanwhile, people from Land of Untold Stories enter find refuge in Storybrooke. Elsewhere, Regina and Zelena bond as they become roommates.

In the meantime, fans must brace themselves for "Once Upon a Time" (OUAT) Season 6 to introduce some new characters such as Jafar and Aladdin from Agrabah and Count of Monte Cristo. In a flashback sequence, Jafar comes face to face with distressed Aladdin.

A promo video for "Once Upon a Time" (OUAT) Season 6 episode 1 "The Saviour" as published on TV Line features the heroes confrontation with Mr. Hyde as he prepares to welcome his friends from Land of Untold Stories.

In an interview with Entertainment Weekly, "Once Upon a Time" (OUAT) executive producers Edward Kitsis and Adam Horowitz teases what happens in Season 6.

"Emma [Jennifer Morrison] and the heroes are going to have to help a whole bunch of people finish their story," reveals Kitsis.

"Some of the things that we're exploring are what is a happy ending? We're exploring fate, destiny, the future, what does that future mean? We are also really exploring the demons within ourselves. Can you just separate the darkness or is the darkness a part of us and we need to be both? We'll see Regina is literally facing herself, but I think that could apply to anyone. We know with Rumple and Gold, we know everybody has the darkness in there, demons in their past that they've come to terms with," Kitsis said.

"Once Upon a Time" (OUAT) Season 6 episode 1 "The Saviour" airs at 8:00 pm on ABC. Fans can also watch the premiere online via live stream on abc.go.com. Stay tuned for more spoilers and updates for episode 2 "The Bitter Draught."