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.

Over the course of several hours, Marvel unveiled the cast of Avengers: Doomsday, with some surprising movie stars being revealed. Of course, Robert Downey Jr. was announced, but some surprises were also packed in there,

Marvel unveiled 27 cast members to announce that Avengers: Doomsday was in production. The reveal came over a five-hour-long livestream where a new chair was revealed about every 15 minutes, before Doctor Doom star Robert Downey Jr. made a brief on-screen cameo.