As the heroes prepare to assemble, we look back on previous films
'Iron Man' and 'Iron Man 2'
'nuff said: Here's where the Marvel movie universe started looking like the Marvel Comics universe. As if having Robert Downey Jr. deliver one of his best performances as cocky billionaire hero Tony Stark wasn't enough, the two Jon Favreau-directed films alluded to other Marvel characters and organizations, and first introduced us to Nicky Fury (Samuel L. Jackson), SHIELD agent Coulson (Clark Gregg) and sexy heroine Black Widow (Scarlett Johannsson), all of whom will appear in "The Avengers."
Worldwide box office: "Iron Man" = $585 million, "Iron Man 2" = $621 million