This Avengers: Doomsday villain surprise would break the box office

Marvel was quick to pivot from Kang (Jonathan Majors) being the main villain of Avengers 5 and Secret Wars to Robert Downey Jr.'s Doctor Doom. Following Major's legal issues in the real world, Marvel dropped The Kang Dynasty subtitle for Doomsday.

Just like that, most of the Kang story was abandoned, and Marvel now has to have RDJ's Doom appear in other MCU movies before fighting the Avengers over the fate of the multiverse.

We always expected RDJ to return as Iron Man, which might still happen.