What was Robert doing at Comic Con this year? I mean, he doesn't তারকা in that Captain America movie, right? So why was he at the conference?

Yes he isn't but he is one of the stars of The Avengers If আপনি want to learn আরো thing about this film আপনি can look
link

He as Tony Stark in The Avengers (2012)

Los Vengadores Porque no খড় nada hijo ironman pecado Porque robert y aparte es La Estrella de nmervel te amo robert hacerjr wney

As stated previously Robert was at Comic-Con because he stars as Tony Stark/Iron Man. He was with the other stars of "The Avengers" movie which is going to be released before "Iron Man 3".