In the sub-atomic kingdom of K'ai, the Hulk gained Bruce Banner's brain but lost his heart to the gorgeous green Grace: Jarella! After the sinister Psyklop gets their world in his hands, the atom-crossed couple seek happiness on Earth, but the odds seem stacked against them in both dimensions! Will the Hulk save his emerald angel and her war-torn world? Can green hearts be broken? Find out in this saga that spans time, space, and [non]human emotion! Guest-starring Captain Marvel and the Avengers! Collects Incredible Hulk #140, #148, #156, #202-205 and #246-248, and What If? #23.