Stranger Things season 5 deepens the show's major retcon, reshaping the entire series' backstory. The season 4 finale revealed Jamie Campbell Bower’s Vecna as the true antagonist, a dark reflection of Eleven who created the Mind Flayer and took control of the Upside Down.
The key question of how much influence Vecna had over Hawkins’ disasters and how many were his doing has now been answered. Netflix released the full opening scene of season 5, featuring a surprising flashback to season 1.
The scene shows a younger Will (Noah Schnapp) trapped in the Upside Down, finally explaining what happened to him after being captured by the Demogorgon. It appears even the Demogorgon served Vecna, and Will was purposefully exposed to the Mind Flayer.
“It was you,” Millie Bobby Brown’s Eleven realized confronting Vecna in season 4. “It was always you.”
This new information completes the retcon started in season 4, significantly altering the understanding of Hawkins' dark history and the battle between Eleven and Vecna.
Author's summary: Season 5 of Stranger Things fully reveals Vecna's deep manipulation behind Hawkins' tragedies, completing the retcon and setting the stage for a final showdown with Eleven.