>> reporter: it's a star-studded event with a few surprises. and the heroic ending that you don't want to miss. >> 2013 cnn hero of the year -- >> reporter: a night to gather together to celebrate the human spirit. >> so, there is so much more after the announcement of the big one, the cnn hero of the year. don't miss the incredible act of generosity that brought the audience to its feet. it's happening on sunday night. let me tell you, when i say no one in the room expected this, i was there. and i'm here as living proof to tell you, we were all absolutely gobsmacked, star-studded tribute at 8:00 pm on sunday on cnn. sending messages from afghanistan to their loved ones back home. but when are they coming home? many were supposed to be home