Over on the latest IGN Movies Keepin' it Reel
podcast (I'd link to it, but can't access IGN from work), one of the guys - Stax, I think - suggests something novel: that ASM2
begin mid-battle with a baddie only featured in that one opening sequence, much like a Bond opening. He makes the rather interesting point that, despite these superheroes having extensive rogues galleries, pretty much all such villains figure into the main stories of the movies at hand. The closest exception I can think of offhand is the Sentinels in X3
, and those of course aren't actually real.