The Marvel Cinematic Universe continues to be a wildly popular franchise, with new releases hitting theaters and streaming with a Disney+ subscription. Fans who spent years watching the Marvel movies in order have seen a ton of heroes introduced, starting off with Robert Downey Jr.'s Tony Stark in Iron Man. While Jon Favreau's 2008 movie was a huge gamble, the Oscar-winning actor recently shouted out two of his Avengers co-stars for playing two heroes that were especially difficult to pull off.
Moviegoers can't wait to see RDJ as Doctor Doom in the next Avengers movie, but the 61-year-old actor is also looking back on what came before. During an interview with CBR, Downey spoke to the two actors he thinks had the hardest job when bringing their heroes to life on the big screen. In his words:
