In 2008, Robert Downey Jr. couldn't have predicted how his life would change when his work as Iron Man hit theaters. The actor's impressive portrayal of Tony Stark went on to inspire Hollywood's top-grossing franchise of all time. This year, the Marvel Cinematic Universe will see Downey return to the screen as Doctor Doom, marking the star's shocking villainous turn. For many fans, they've already got it down that Downey's Doom will be the best villain of the year, but that just isn't the truth.