The Russo Brothers have sent Marvel fans into a frenzy with their latest Instagram tease for the highly anticipated Avengers: Doomsday. Despite being just a simple green image, the brothers have tagged the official accounts of Marvel Studios, The Avengers franchise, Robert Downey Jr., AGBO Films, and SXSW London fan event. This isn't the first time the Russo Brothers have posted cryptic teases, but this one seems to be causing quite a stir due to its simplicity. Fans are analyzing every detail, from the shade of green's Hex color values to potential connections with Avengers: Endgame timestamps. While the meaning behind the image remains unclear, many believe it could reference Doctor Doom due to the color green. With Avengers: Doomsday set to release on December 18, 2026, fans are eagerly anticipating more news about their favorite superheroes. Interestingly, Marvel is planning to re-release Avengers: Endgame this September with new footage added in, leading some to speculate that we might see Doctor Doom before the official release of Avengers: Doomsday. Keep an eye out for more updates as this story unfolds! Image credit: Marvel. Tom Phillips is IGN's News Editor and can be reached at [email protected] or found on [email protected].