What happened to Bruce Banner in that cave?

As the monsters' war on humanity rages across land and sea, Bruce Banner and Betty Ross have finally found their life of quiet normalcy, free from their past and the threat of the Infernal Hulk...or so they think. Is Banner really free? How long can they hide as the world burns down…and what happens when their nightmares find them? Guest-starring IRON MAN, the fate of Bruce Banner is revealed in this pivotal issue! RATED PARENTAL ADVISORY.