Avengers #216 is the issue in which several of Tony's teammates finally learn his secret identity -- and that he's fond of little red thongs. ;) But this scene is even more interesting because it demonstrates quite well what I said a few posts back about how Tony would solve the trolley dilemma. Pull the lever, he thinks -- then take full responsibility. (And since I'm not really an idealist, I find myself taking his side in this instance. One versus 4 billion? And the one is the individual threatening the 4 billion? The choice here seems pretty clear to me.)