Well, it seems that Tony Stark gave Bruce Banner some of the Extremis, the very same biological formula that gave Tony stark the ability to summon his Iron Man armors at will.

It lasted until the end of Dark Reign and it wasn't mentioned again until the start of Marvel Now and also the Iron Man 3 movie.

Now that it's in the HULK/Bruce Banner. Yet, we all saw how it help/harmed Tony Stark, but I do wonder wonder what will it do to the Hulk and as Hulk fans...how should this be viewed given the Hulk's history ?

I mean even I question it all considering how Waid ended this run and had the Hulk's healing factor cut.