I don't understand why they always hold back the bad guys with these comic book movie lines either, and then when they do release them, it is often in smaller numbers. I can understand, to some extent, the various versions of the main hero. Iron Man in particular works pretty well for this (both movie and comic), since he changes his suit a lot (or, in the case of comics, has had multiple versions). But the lack of supporting characters or baddies I don't get. I know they are coming eventually, but I think they should at least have Whiplash out there a bit earlier. I guess there is an Iron Monger from the first movie, but still...even kids like to have the bad guys I think, particularly in this "1 on 1" scenario of hero vs. villain. Otherwise Iron Man just has to fight a different version of himself.