We're heading into the mid-season finale for Supernatural. Here's what we know.
 
The official press release.

The Bad Place” — (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)

JACK AND KAIA DISRUPT THE WORLD – Jack (Alexander Calvert), desperate to prove to Sam (Jared Padalecki) and Dean (Jensen Ackles) that he is good and that he can control his powers, enlists the help of a dreamcatcher named Kaia (guest star Yadira Guevara-Prip) to help him find Mary Winchester (guest star Samantha Smith) and save her from the alternate universe. However, when plans go awry, the Winchester brothers are the ones who need saving. Phil Sgriccia directed the episode written by Robert Berens (#1309). Original airdate 12/7/2017.

 
The original trailer
 
 
An interview with Jared and Jensen on this episode
 
 
Sneak peeks
 
 

 TV Guide has another sneak peek.
 
And we have another one
 
 
 
Anything on the Supernatural mid-season finale? I can’t wait for more Jack! — Jane
Yes, Jack is back, and he’s on a mission that will introduce him to newcomer Kaia, a dreamwalker. But there’s still the question of whether Jack is good or bad, which will be answered — at least for the time being — by episode’s end. Also by episode’s end? A major cliffhanger that will set the stage for the Wayward Sisters backdoor pilot. Let’s just say it’s something Sam and Dean have never dealt with before.
 
 An interview with Robert Berens and Andrew Dabb on Kaia and this episode.
 
The official title for Kaia is a dreamwalker, and let’s just say that title makes her important, and not just to a potential spin-off. “We’re introducing Kaia in [episode] 9, but it’s not just for the purpose of the spin-off,” executive producer Andrew Dabb says. “She’s very vital in the mythology we’ve been building toward the entire first half of our season.” Speaking to how the introduction of both Patience and Kaia compares to the series’ first spin-off attempt with Supernatural: Bloodlines in season 9, Dabb continues, “These characters are a part of the DNA of our show and we wanted to bring them organically into the fold in a way; to be completely frank, Bloodlines we didn’t. [Bloodlines] kind of dropped you in the middle of a whole other story. So Kaia is important to the spin-off but she’s also important for Sam and Dean, and that will allow the audience to really sympathize with her, understand her, and see what she can do.”
 
The promotional pictures
 
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For more rumors and BTS information see the discussion thread for episode 9.
 
Jack is back and trying to prove he is good, by finding Mary. What do you think goes wrong that puts Sam and Dean in danger? Will Jack get Mary out of the AU? What role will Kaia, the dreamcatcher, play?  Will she be the one showing Mary to Sam and Dean? The pictures show us a Powers!Jack. How strong have his powers grown? We get to find out if Jack is good or bad! Which do you think he is? Does this look like an exciting way to get us to hiatus? Tell us in the comments or in the discussion thread for episode 9.