Obviously spoilers after few empty lines.
Galactus already is weak and dying it seems while BRB continues destroying planets even without his hammer, well ships does the destroying part now i guess. I`thans have regrouped and collected all their weapons and stuff, they are bent on killing both, Galactus and BRB.
Surfer comes to another planet. BRB tries to buy time while using old weapons from the ship. Of course he can`t harm Surfer. Then we get explanation that after Annihilation Galactus is still weak and such short malfunction in his consumption of planets has weakend him even more. Also that I`thans now have enough weapons to kill Galactus on their own. BRB doesn`t understand what Surfer wants from him but then he explain that there will be very big bang if Galactus dies and crapload of planets(with life) will be destroyed. BRB broken allows Galactus to consume planet.
But their conversation was recorded by I`than spies and they don`t care about big explosion after Galactus, revenge will be theirs.
So fighting starts betwean I`than forces and two heralds while Galactus is busy restoring his strenght. BRB notices that heralds won`t be able to halt them long enough and decides to help Galactus. Voidan of course mocks him all the time. But what can he do without his hammer? He overrides ships controls with some code and uncouples his reactors. It grants him lots of power but he`ll implode in about a minute.
Everything goes well. Galactus is healthy again and of course saves BRB`s life. Asks why he tried to unmake Galactus and then ressurects one female Korbinite so that BRB would have something to protect again.
Both of them get back to earth and i think decide to life here. Oh and BRB manages to lift hammer again after his "sacrifice".
Bad start but okish ending. Not looking forward to his run on Thor.