It was back in 2008 that Hollywood actor Robert Downey Jr. starred in the Iron Man -- the movie that got the Marvel Cinematic Universe (MCU) rolling. He might not return to MCU after their forthcoming film Avengers: Endgame, but all he has to say is "don't give up, keep going".

Sporting a black suit with chic boots, RDJ hit the stage on Monday along with his Avengers: Endgame co-stars Brie Larson and Jeremy Renner as well as directors Joe and Anthony Russo and Marvel Studios President Kevin Feige amidst thousands of young fans dressed up as Marvel superheroes like Iron Man and Captain America.