I can almost certainly say they are NOT putting every one of those characters onto the Avengers. They're probably just doing a bigass crossover episode where the Avengers muster up every hero they can find. Given how long the this season has been in production for, and given the presence of HIGHLIGHT to view:Vision and Winter Soldier
this probably takes place mid or even late season.
Hell, the Fantastic Four already cameo'd on the show like three times now. As did Wolverine during the WW2 episode. This isn't too uncommon.
The Hulk was an Avenger for an issue and a half. THe first two. Then he left and never rejoined.
I believe the point Database was making is that, in the show, the Hulk is a fairly stable member of the team now, and yet he has an extreme loner personality.
Edited by Undead Scottsman, 29 March 2012 - 10:45 PM.