Hiro-Kala fights his brother Skaar, and the planet K'ai is breaking appart as a result. Hundreds of K'aitians are killed. Hiro does not seem to care. But his father, Bruce Banner, does. He puts his mind to use helping the Worldmind heal the Zombies, turning them back into normal beings. When this happens, Betty Ross embraces and kisses Bruce with love.
Meanwhile, Hiro is still loose, destroying. A-Bomb and Korg are able to reactivate the volcanic eruption which moves the planet K'ai from its trajectory, missing (and saving) the Earth from a catrastophic impact.
Skaar tries to reason with his evil brother speaking about their mother Caiera, and how he can change to stop being a monster. But Hiro seems to be a lost case. So Skaar uses his Old Power to trap him into unbreakable stone, and the Worldmind absorbs Hiro in itself, trapping him as a part of the planet, to use his energy to warm the planet.
With the villain defeated, Banner, Skaar, and the Hulks leave K'ai in the Sakaarian spaceship. Betty Ross runs toward the Hulk with joy because he just saved "everyone". But the Hulk knows "everyone" does not include his son Hiro, and screams back to her. She turns into the Red She-Hulk, and leaves her former husband alone. But she gets it: Some people are meant to be left alone, like Hiro, and the Incredible Hulk.