STOP EVERYTHING! You thought you knew the secrets of the Upside Down, but you missed the biggest clue of all. This is the CRAZIEST detail from the final seasons of Stranger Things that fundamentally changes everything we know about Season 5!br br We deep-dive into a subtle moment (a symbol, a line of dialogue, or a character's action) that the Duffer Brothers strategically hid, revealing a jaw-dropping connection between the main characters and Vecna (Henry Creel).