This article is about the episode. For the entity, see The Mind Flayer.

"Chapter Eight: The Mind Flayer" is the sixteenth episode of Stranger Things and the eighth episode of the second season. It premiered on October 27, 2017. 


An unlikely hero steps forward when a deadly development puts the Hawkins Lab on lockdown, trapping Will and several others inside.


The Demodogs invade Hawkins National Laboratory and begin killing everyone inside. Realising they are homing in on Will, Joyce sedates him. The building's system crashes, locking Will, Joyce, Mike, Hopper, Bob, and Dr. Owens in a security office. Bob volunteers to get the power and systems back on line.

Dustin, Steve, Lucas, and Max track the demodogs to Hawkins Lab, where they meet up with Nancy and Jonathan.

Bob successfully restores all the systems, allowing everyone to escape. Dr. Owens remains behind to guide them all out, but Bob is caught by one of the Demodogs and is killed. The escapees regroup with everyone at the gate and they head off to the Byers' household.

Realising that the shadow creature is controlling Will and the Demodogs, the group reasons that they can interrogate it. Tying Will up in his tool shed and trying to disguise it so that Will has no idea where he is, they question him. They soon realize that Will is using morse code to tap out a message – "CLOSE GATE." When the house phone rings, Will and the creature realize where they are. Despite being sedated again, the Demodogs head for the house.




  • "The Love You Save (May Be Your Own)" by Jack Cook - Max's mom and step-father arrive home and find Max's room empty with the window open.
  • "The Four Horseman" by Metallica - Billy listens to some music while smoking and getting ready for his date. His father and step-mum enter his room concerned for Max's whereabouts.
  • "Should I Stay or Should I Go" by The Clash - Jonathan plays a song that he and Will first listened to together: They then distract him while Chief Hopper figures out the Morse Code with Dustin, Lucas and Max.

Original Score

  • "Eulogy"
  • "Looking for a Way Out"
  • "Soldiers"
  • "The Return"


[Coming 2017]


  • Main cast member Cara Buono (Karen Wheeler) does not appear in this episode.
  • On August 31, 2016, the second season was announced through a trailer published across social media, listing the titles of the nine episodes. The trailer shows that the eighth episode was originally titled "The Brain". The new title of the episode was revealed on October 27. 


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