Warning: This article contains spoilers for Stranger Things season 4 volume 1.
Stranger Things season 4 dramatically retcons the history of Hawkins Lab and the Upside Down. It's easy to forget the Duffer brothers originally approached Netflix with what they intended to be a limited series. "Maybe I shouldn’t say this because I like to pretend that it was all planned out," Ross Duffer recalled in an interview in 2017, "[but] Eleven was gonna sacrifice herself and save the world, and then that was gonna be it, because there was a moment where limited series were a big deal." (via Cinemablend)
Fortunately, the decision-makers at Netflix believed Stranger Things had potential, and they asked the Duffer brothers to reconsider. Years later, the streaming giant has released Stranger Things season 4, and there are plans for Stranger Things spinoffs as well. Naturally, because there had been no initial plan, by this point the retcons are beginning to build up — especially given Stranger Things season 4 finally reveals the secret origin of Hawkins Lab and its test subjects.
Related: Stranger Things 4 Volume 1 Ending Explained (In Detail)
Some of these retcons fit well with the established continuity, while others are rather more contradictory. Frustratingly, lovers of the Stranger Things expanded universe — the range of tie-in novels and comics that have been published over the last few years — will find they don't sit comfortably with stories told in other mediums. Here are all the major retcons in Stranger Things season 4 volume 1.
Stranger Things season 4 introduced Dr. Brenner's "Number One," Henry Creel, the patient who inspired him to begin his unethical research into paranormal abilities. Previous seasons had suggested all
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