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What Is the Monster in Stranger Things Season 3 Theory

Why the New Monster in Stranger Things Season 3 Is Likely a Character We Already Know

I've long wondered how the Duffer brothers were going to revamp the story for Stranger Things season three. The past two seasons have roughly followed the same formula, after all: a group of lovable, quirky kids battle against a sci-fi monster with the help of their telekinetic pal, without the rest of the town ever being the wiser. But a repeat of the same recycled story — Will succumbing to the Upside Down's power in some way, Eleven saving the day — would've been a little too familiar third time around, no?

Fortunately judging by the season-three trailer, a new monster and potential infection ravaging Hawkins promises some fresh excitement for the Netflix hit. But what if the red, pulsing, spiky creature we see unleash a roar towards the end of the trailer doesn't originate in the Upside Down — what if under all that goo it's actually one of the characters we got to know last season? Specifically, what if it's Billy Hargrove (Dacre Montgomery)?

As a reminder, Billy is introduced in season two as the metal-loving, mullet-rocking older brother of Max (Sadie Sink), who is forced to move to Hawkins so her family can have a fresh start from their lives in California. He's a bully through and through and doesn't inspire much sympathy, but at the end of the season we discover that he's actually stuck in a cycle of abuse, since his father is physically and verbally violent.

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In season three, which takes place over the course of one Summer in Hawkins, Billy has gotten a job as a lifeguard at Hawkins Pool — he's seen strutting around shirtless in the trailer, flirting with a few different girls. But the important thing to note, chiseled pecs be damned, is the shot of him in the shower with a deeply troubled look on his face as he examines some kind of red and black growth blossoming on his left forearm.

So, what could this mean? The poster and previous teasers for the season included rat imagery and footage of rats running through a warehouse. Rats are known for carrying disease, right? What if the rats living underground in Hawkins got into those tunnels that Hopper and the kids were wandering around in under the pumpkin patch in season two and are now carrying an infectious, Upside Down-borne illness? The infection on Billy's arm is in the same red and black shades as those gross, slimy vines that are all over the Upside Down, so it checks out.

Obviously, we can't be sure of how the rats came in contact with Billy, but it wouldn't be that hard to imagine the animals inadvertently spread the disease to the pool somehow. That scary-looking infection doesn't seem to just be on Billy's arm, either — another shot in the trailer is a close up of his eye, which has black tendrils reaching across his eyeball toward a very dilated pupil.

Obviously he's enduring some terrifying transformation . . . but into what?

That question brings us to the trailer's final scene, which is of a new Upside Down monster. It appears to be growing larger and larger in the hallway of a hospital, with Nancy and Jonathan on either side of it, looking on in horror. Judging from the way it expands on screen, slowly but surely hulking out in the darkness, it seems like whatever it is, it's transforming from a human body into the creature that we see roar a few seconds later.

Picture this: Billy goes to the hospital to get treated for the infection on his arm and in his eye, but by the time he gets there, it's too late. Hawkins Medical Centre doctors don't know how to deal with Upside Down-level bacteria or monster DNA! So, Nancy and Jonathan descend on the hospital in hopes of saving Billy (or, at the very least, trying to take him out before he transforms), but they arrive just a little too late. That would certainly explain Nancy's look of total horror and running mascara as she finds herself with a giant, bloodthirsty creature between her and her boyfriend.

Fortunately we all have plenty of time to think this theory through, since Stranger Things season three doesn't arrive on Netflix until July 4.

Image Source: Netflix
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