it was after heroes reborn.
there where 2 hulks actualy. the one with banner had long hair and was inside that pocket dimension franklin richards had made.
but the one in the real world had no banner and was a raging monster that was generating and radiating a shit ton of gamma energy.
eventualy when the heroes in the pocket dimension get released. this hulk and banner hulk merge again.
became 'gravage' hulk (savage hulk, but more intelligent) because of a wound he had shrapnel inside his head.
apocalypse had the means to remove it, but in return he wanted hulk to become his horseman war, hulk accepted fought juggy and nearly cut his head off but was stopped by rick jones.
then he ripped the celestial tech off and left.