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.

With the promise of an all-star cast led by Robert Downey Jr. as Doctor Doom and Infinity War and Endgame’s creative team back in action, the fifth Avengers movie could bring back much of the franchise’s lost spark.

When the Marvel Cinematic Universe released its first tentpole film The Avengers in 2012, its success (grossing $1.5 million worldwide) set off a phase of superhero mania — where the least connected of films could get people to fill seats at the mere hint of a new casting or surprise cameo.