Robert Downey Jr. Hijacks Chris Cuomo's NewsNation Broadcast for Surprise Cameo: 'Not Expecting This, Were You?' | Video

Robert Downey Jr. made an unexpected appearance on Chris Cuomo's NewsNation broadcast Tuesday evening, where he declared the news organization the "best in the business." The Marvel star, who is set to make his debut as Doctor Doom in "Avengers: Doomsday" at the end of this year, revealed he decided to make an impromptu visit to the control room at NewsNation after attending the Disney Upfront presentation earlier in the day. "What's up, dude? You were not expecting this, were you?" Downey Jr. said to a surprised Cuomo, who playfully roasted the actor as "Aquaman." (As . . .