Marvel may have allowed Thor to become too comedic, losing his serious threat as a powerful character. Avengers: Doomsday can reset Thor by giving him a more serious role, allowing Chris Hemsworth to showcase deeper acting.

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.

Perhaps attempting to prove that reports of imminent box office demise have been greatly exaggerated, Marvel on Wednesday announced major casting news for its upcoming “Avengers” sequel that both flex the power of its history and set it up for the future.