Stranger Things Very Inriguing Fan Theory (Spoilers)

Eleven and the Monster are actually one and the same. The Monster is just a manifestation of El's fears and horrific past. That's why they mirror each other.

Here's a video explaining it all in great detail. LINK

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The "proof" from the show As the above video from Uproxx helpfully explains, this theory is all about duality. When Eleven first encounters the blood-loving monster, she's in a sensory deprivation tank -- not in the alternate dimension known as the Upside Down. When we see Eleven in the blank nothingness space, which resembles the place Scarlett Johansson took her victims to in Under the Skin, we are watching her create the monster in her mind, possibly as a side effect of her telekinetic powers and the drug-testing inflicted on her by Matthew Modine's twisted father figure. The tank scenes are an important part of the puzzle. Then there's the climatic showdown between Eleven and the monster, which takes place in the show's final episode. As many fans have noticed, she even says, "I am the monster," echoing an idea that Lucas raises at various points in the show. Of course, it's possible that she's speaking metaphorically -- like many science-fiction and fantasy heroes, Eleven is inextricably linked to her nemesis -- but for the purposes of this crazy theory, let's take her comment literally. What if the monster is the Upside Down version of Eleven? This theory could explain why she disappears into a cloud of ash following the big throw-down: in order for the monster to leave, she must also sacrifice herself. As fans on Reddit have pointed out, the theory would also help explain why Eleven is able to recognize Will and Barb in photos without ever having met them. If true, her powers connect her to the monster because they are, in fact, one and the same.

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