Hulk revisits the site of the first gamma bomb test–the one that made him–where he finds Maestro’s skull, who was killed in that same test during Future: Imperfect. He’s there because he’s been hanging out with Janis Jones, and other refugees from that possible future have been showing up around him. This is build-up for a bigger story.
Hulk decides that the Florida key island now belongs to him.
The military intervenes ineffectively, but what does cause some problems for Hulk is…Hulk. Apparently, there are now a bunch of alternate reality Hulks and the Onslaught Event made 616 Hulk a kind of magnet for them (which explains how Bannerless Hulk is in the Heroes Reborn reality while the 616 still kept a Hulk for itself). This Hulk is also from the Future: Imperfect world.
They fight, it’s fun, and alternate Hulk is sucked into a void before he can deliver an important message.