Robert Downey Jr’s Avengers Endgame Iron Man hidden in Avengers Doomsday poster | Films | Entertainment

Alongside the launch is a new poster featuring Doom facing a mural of what appears to be his universe collapsing due to an incursion, when the boundaries between two realities erode, causing them to collide and potentially destroy each other. Now eagle-eyed fans have spotted in the background what looks likely to be Downey Jr’s Iron Man, aka Tony Stark, performing the snap in Avengers Endgame that saved Earth-616 at the cost of his own life.

One new fan theory on X reads: “Tony Stark WAS Earth-616’s Anchor Being and his death created Doctor Doom!. The poster explicitly hides Tony snapping in the background tapestry for a reason. Deadpool & Wolverine established that when a universe’s Anchor Being dies, that universe slowly decays and causes Incursions. Tony Stark was Earth-616’s Anchor. When he snapped in Endgame, he saved his timeline but initiated its long-term death sentence.

The fan theory continues: “In a neighboring universe, Victor von Doom watched his own reality collapse due to the Incursion caused by Tony’s sacrifice. Doom carved Tony’s snap into his fortress as a reminder: Iron Man’s heroism destroyed Doom’s entire world. Doom isn’t invading Earth-616 for power, he’s getting revenge on the universe whose hero killed his world!”

Avengers Doomsday hits UK cinemas on December 18, 2026.