Everything we know about Supernatural season 14 episode 10.
The official press release.
 

SUPERNATURAL
“Nihilism”— (8:00-9:00 p.m. ET) (TV-14, LV) (HDTV)
THE BATTLE AT HITOMI PLAZA CONTINUES – Michael has re-taken control of Dean (Jensen Ackles) as his army of monsters continues to move in on our heroes. Sam (Jared Padalecki) devises a plan to try and reach Dean and stop Michael before anyone else has to die. The episode was directed by Amanda Tapping and written by Steve Yockey (#1410). Original Airdate 1/17/2019.

Source:

The CW

 
The original trailer.
 
 
The Extended Trailer
 
 
The Shaving People, Punting Things promo. WARNING! may contain spoilers for episodes other than episode 10!
 
 
It looks like we will have a returning guest star... but will it be in this ep?
 
 
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So this picks up where we left off. The monsters are coming and Michael is in control an apparently Michael's first order of business was to get out of the flannel and into some fancy clothes. Sam comes up with a plan to reach Dean. Will it work? Will Dean be able to take back control permanently or will the specter of Michael loom over us for the rest of the season?  This looks like it may be a bit of a bottle episode, using our regulars and set in the bunker?Give us your thoughts in the comments or in the discussion thread for episode 10.

AdmirorGallery 5.2.0, author/s Vasiljevski & Kekeljevic.