>It's a shame Annabelle's great-uncle didn't hang around. He might
>have come in handy in Republic City or at the Fort. Come to think of
>it, I don't recall them existing as team in UF, but I think the
>Avengers in general would have come in handy in either location that
>day.

I don't think they're a thing... but there's a Thor, Iron-Man, Hulk and Captain America - one of whom was an Avenger back in the Marvel'verse. So having them team up with Tony making remarks about "Hey, this feels familiar" when none of the others have met before would be possible.