A space capsule occupied by astronauts Beame and Wagner is surrounded by a rare white vapor before it clashes to the sea. Namor, who was in the area, saves them from being swallowed by a giant squid. The two pilots decide to change the space program for a quieter job. And disguised as Cap'n Cal and Xemnu, they become TV celebrities by hosting a children's program called Astro-Nuts. The audience loves it.
But nobody knows that Xemnu is Wagner no more. He's an alien with enormous strength and psionic powers who intends to bring human children to his planet.
Jim Wilson suspects something is fishy and contacts Doctor Strange. The sorcerer, disguised as the Hulk, assists as a special guest for an edition broadcasted from Cape Canaveral (Cape Kennedy).
Meanwhile, Bruce Banner sees himself (his alter ego) on television, he changes into the jade giant and leaps towards the impostor.
Xemnu hypnotizes children instructing them to go aboard a rocket. Doctor Strange removes his Hulk disguise and tries stopping the monster. But Xemnu resists his spells. Namor is called by the sorcerer but can't stop Xemnu either. It's the Hulk who defeats the alien (he punches until Xemnu simply turns into vapor) and prevents the children from been stolen.
Despite all, Thunderbolt Ross' soldiers attack the giant but little they can do. The Sub-Mariner and the Hulk leave the scene regretful of having helped. Doctor Strange casts a spell to erase the memory of children and the world about these events.