Anthony Russo was recently asked how they will explain RDJ’s return and his answer was well, mysterious: “We can’t explain that as it’s part of the story,” he said with

The Russo Brothers made their debut with 2014's Captain America: The Winter Soldier and returned for the 2016 sequel Civil War.

Julian McMahon, who portrayed Victor Von Doom / Doctor Doom in 2005’s Fantastic Four and its 2007 sequel, Fantastic Four: Rise of the Silver Surfer, has given a big thumbs up to the casting of Robert Downey Jr.