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.

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.

The Marvel Cinematic Universe is entering its sixth phase, and one of the most critical films in this chapter will be Avengers: Doomsday. During a nearly five-and-a-half-hour livestream, Marvel announced the blockbuster’s cast – and there was no shortage of genuine surprises.