In Stranger Things, the Mind Flayer has not been definitively, permanently killed on-screen so far; only its temporary physical forms have been destroyed, while the true “shadow” entity is still implied to exist.

What actually got “killed”?

  • In Season 2, Eleven closing the Gate cuts off the Mind Flayer’s direct influence on Hawkins but does not erase the core entity in the Upside Down.
  • In Season 3, the big fleshy spider-like monster in the mall (the Mind Flayer’s physical avatar built from human and animal bodies) is destroyed when the new gate is closed; this kills that body , not the underlying hive-mind shadow.

Current status after Season 5 Volume 2

  • Recent breakdowns of Season 5 Volume 2 emphasize that the original “shadow” Mind Flayer still exists as part of a wider hive-mind and particle system, linked to Vecna and the Upside Down.
  • Official explainers describe children like Holly and others being infused with Mind Flayer particles, with a massive pulsing heart-like structure above Vecna, suggesting the entity (or its core power) is still active rather than dead.

Fan theories and forum talk

  • Many fans argue that the Mind Flayer is either the true final villain or at least the deeper force behind Vecna, pointing to scenes of the shadow cloud Henry/Vecna encountered in Dimension X.
  • Popular theories say the spiky “cave” or claw-shaped structure seen in newer episodes might actually be the dormant or evolving body of the Mind Flayer, waiting to be fully reawakened in the series finale.

So, did they kill the Mind Flayer or not?

  • They have destroyed:
    • Its direct gateways.
    • Its Season 3 flesh-monster body.
    • Some of its extensions/particles.
  • They have not clearly, canonically killed:
    • The original shadow-hive entity itself, which is still teased via particles, the giant heart, and Vecna’s connection heading into the final episode.

Quick TL;DR

  • The Mind Flayer’s bodies = yes, some have been killed.
  • The real Mind Flayer (the core shadow/hive mind) = still out there, with the story heavily hinting it will play a major role in the Stranger Things series finale rather than being “dead and done.”

Information gathered from public forums or data available on the internet and portrayed here.