When Robert Downey Jr. steps into a Marvel role, he has a way of creating moments that stick with people. According to directors Anthony Russo and Joe Russo, the first time Downey revealed Doom's voice became one of those unforgettable MCU memories. In fact, Joe Russo puts it in the same category as Tony Stark's legendary "I am Iron Man" snap from Avengers: Endgame. Joe Russo said hearing it for the first time gave him chills, and he didn't hesitate to compare it to one of the defining moments in MCU history. If the Russos are putting Doctor Doom's voice reveal in that same conversation, that’s interesting.