Avengers Doomsday Tony Stark Existence Fan Theory

The Avengers: Doomsday trailer dropped and basically sent the fandom into overdrive hunting for clues. A particularly wild theory's gained traction suggesting Tony Stark might never have existed in the MCU continuity—which, if true, would fundamentally restructure everything fans thought they understood about the universe. Fans have been rewatching Loki and digging through years of MCU lore trying to verify this theory. It's the kind of speculation that sounds insane until you start considering the timeline implications and what Robert Downey Jr.'s rumored return might actually mean narratively.