Robert Downey Jr. returns to the MCU with other confirmed actors including stars Chris Hemsworth and Tom Hiddleston, 'X-Men' stars like Patrick Stewart and Ian McKellen, and a good chunk from the studio's 'Thunderbolts.

"Avengers: Doomsday" finds brothers Joe and Anthony Russo back in the directors chairs. They return to Marvel having helmed the Captain America films "Captain America: The Winter Soldier" and "Captain America: Civil War," as well as "Avengers: Infinity War" and "Avengers: Endgame."

Other snubs include OG Avengers such as Mark Ruffalo (Bruce Banner/Hulk) and Jeremy Renner (Clint Barton/Hawkeye). Chris Pratt (Peter Quill/Star-Lord), Brie Larson (Carol Danvers/Captain Marvel), Iman Vellani (Ms. Marvel), and Benedict Cumberbatch (Doctor Strange) were also left out.