Sam (Jared Padalecki) and Dean (Jensen Ackles) will embark on their final hunt this fall, and the Winchesters have one hell of a fight left before their journey on Supernatural comes to an end. The show's 15th and final season is poised to be the grandest of them all, with Team Free Will set to go toe-to-toe with God following that bonkers Season 14 finale.

As we gear up for one epic last ride with the beloved ass-kicking brothers, plenty of questions remain about where the show--and its unforgettable characters--are headed in the final season. Here's everything we know about Season 15 of Supernatural so far.

The Only Supernatural Refresher You Need Ahead of Season 15

Supernatural begins its final run this October. Mark your calendars, Season 15 premieres Thursday, Oct. 10 at 8/7c on The CW.

The boys will go through an existential crisis. Sam, Dean, and Cas (Misha Collins) ended Season 14 surrounded by an army of the undead after Chuck (Rob Benedict) unleashed Hell on Earth. With the creator of all things no longer on their side, the beginning of the season finds them struggling to come to terms with the fact that God isn't the benevolent being they all thought he was.

"The best way to characterize what Chuck did in the finale [is he] stomped his foot in a rage and tore a hole between Hell and earth," showrunner Andrew Dabb told TV Guide during San Diego Comic-Con. "We're with Sam, Dean and Cas who are like, 'Oh we have to clean up this mess left by this entity that we've just discovered has been pulling on our strings this whole time.'"

"When the rug is pulled out from under you, that's a big creative adjustment and we deal with that in several episodes," added executive producer Brad Buckner. This season will explore what it means to have free world as the gang faces their toughest battle yet.

Jack will be back. Chuck may have sent Jack (Alexander Calvert) to the Big Empty with the snap of a finger, but that doesn't mean we've seen the last of the young Nephilim. Executive producer Bob Berens told TV Guide that Jack will spend the early part of Season 15 in the place were all angels and demons go after they die, adding that Calvert will also appear in some other form.

Misha Collins Says Filming Supernatural Season 15 Is 'Painful': 'Every Day Is a New Last'

Adam will also return, along with other familiar faces. It looks like the Winchesters will finally get closure with their half-brother Adam, who's been locked away in Lucifer's (Mark Pellegrino) cage since Season 5. Jake Abel, who plays Sam and Dean's younger sibling, is confirmed to return to the series but he won't be alone.

"We're looking at some characters that you've seen before who will come back in different ways and some characters who we haven't met quite yet coming in or being more fully realized," Dabb teased. "People like Death [and] the Empty, these kinds of primordial forces we've introduced but we haven't really gotten to know them in a big way."

Chuck won't be the only bad guy the Winchesters face this season. There will also be "demi-bads," according to Berens.

Jensen Ackles will direct an episode this season. Ackles, who helmed a handful of episodes including Season 11's "The Bad Seed," will again sit in the director's chair this season. Plus, Matt Cohen, who played young John Winchester on the series, and Richard Speight Jr., who played the archangel, Gabriel, will also direct Season 15 episodes.

You'll probably be satisfied with how Supernatural ends. "I feel like for the majority of the fans and the people that have been with us through this journey, it's certainly going to feel right and it's going to feel good," Jensen Ackles said of the show's ending during the Television Critics Association's summer press tour. "It should put a lot of people in a position of feeling great about the journey they took with us and the Winchester brothers. That's certainly how I feel about it, and we're really excited to tell that story."

This may not be the absolute end for Sam and Dean. Although the cast and crew are approaching the series finale as a "true ending," there's still hope that the Winchesters hop back into the Impala for new adventures down the line. "This is a long journey that I don't think is ever going to be over," Ackles said. "I think we're just going to go away for a while. How long I don't know."

"I'm not ever ready to close doors or burn bridges. I think that's foolish," he added. "Am I saying that there's something in the works? No. Am I saying that I'd be open to the conversation about doing something in the future? What's the harm in that?"

A Season 15 trailer teases the return of some familiar faces. This first preview for the final season features a throwback to the pilot, teasing the potential return of the Woman in White among others.

The final season poster is pure art. The piece, which you can check out here, includes a stairway to heaven.

Christian Kane is headed to the series. The Angelalum will guest star as Leo Webb, a former hunter and friend of Dean Winchester, according to Entertainment Weekly.

Supernatural returns for Season 15 Thursday, Oct. 10 at 8/7c on The CW.

(Disclosure: TV Guide is owned by CBS Interactive, a division of CBS Corporation.)

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