─── Based off the comics! "An alien named Zius has been protecting innocents from the world-eating menace known as Galactus. Using advanced science, Zius has developed an "intergalactic shareware" technology capable of rendering planets invisible to Galactus' detection. Zius learned however, that in this vast universe there is one unique being who has a natural ability to nullify his cloaking shields: Sue Richards. Zius marked her for death before Galactus could someday exploit her power, and only by hiding Sue's abilities in Johnny's body and vice-versa so Reed could throw Zius off her trail. All seemed well until Galactus appeared, killed Zius and his crew, and took Johnny instead" (as his herald).
Reed hoisted himself down after carefully helping to land Ben, since Sue wasn't really able to master Johnny's powers. Sue landed closely behind still blazing. " Right before Galactus kidnapped your brother, he transformed him with a burst of energy. My best guess is that -- as he's done with other beings in the past, such as the Silver Surfer -- Galactus had recruited Johnny to be his newest Herald. " He explained to the pair without looking at him. He stared at where Johnny had just been mere seconds ago. Gears already turning in his head for a plan.
Though Sue wasn't particularly happy, with reason. It was supposed to be her. It was Reed that actually did this. Though with Johnny's powers (as she'd discover very soon) your emotions are heavily tied to it.