Stranger Things: 27 Behind-the-Scenes Photos From the New Season That Will Flay Your Mind

Caleb McLaughlin, in character as Lucas, flashes a thumbs up.

Dacre Montgomery and his mullet go over a script with Shawn Levy.

Matt and Ross Duffer pose with Priah Ferguson (aka Hawkins queen bee Erica).

The cast gets a few pointers from director Uta Briesewitz.

Producer Shawn Levy gets some work done in between scenes.

Cocreator Matt Duffer on set.

Cocreator Ross Duffer hangs with the young cast during one of the season's scenes at the Starcourt Mall.

The Duffers on set with the cast.

Finn Wolfhard, Charlie Heaton, and Natalia Dyer take a break from battling the Mind Flayer in this shot.

The Duffers no doubt contemplating something important.

Noah Schnapp, dressed as Will the Wise, chats with Shawn Levy.

Charlie Heaton checks out some footage.

The Duffers go for a stroll around the Hawkins Community Pool.

Winona Ryder and Uta Briesewitz discuss a scene.

Winona Ryder and Shawn Levy speak while filming inside the set of Mayor Kline's home.

Finn Wolfhard, Charlie Heaton, and Natalia Dyer strike a pose.

The cast and producer Shawn Levy on set.

Noah Schnapp and Finn Wolfhard film a tense scene involving their characters in the woods.

Director Uta Briesewitz on set during season three.

Millie Bobby Brown and Sadie Sink rock their '80s threads at the mall.

The Duffers advise Dacre Montgomery during a scene at the pool.

This is what was really going on while filming those carnival scenes.

Producer Shawn Levy strikes a pose.

Caleb McLaughlin and Noah Schnapp film a scene.

A behind-the-scenes look at how the grocery store scene came together.

Director Uta Briesewitz crouched in the living room belonging to Heather the lifeguard.

Millie Bobby Brown had a LOT of fun while filming season three — can't you tell?!