The Fantastic Four are returning from their adventure on the moon, landing their rocket at the airport to a crowd of their fans. Exiting the ship they are swamped by fans, as well as fame seekers such as the wrestler known as the Golden Angel who challenges the Thing to a fight, with disastrous results. After Sue is harassed by Hollywood agents the Human Torch helps his teammates flee back to the Baxter Building by creating a hot air funnel to carry them back home. After settling in, Reed is disturbed to find Sue monitoring the world's oceans to try and find the Sub-Mariner, damaging his self-esteem and leaving him to question the future of their relationship.

Meanwhile at a local sanitarium, the Puppet Master -- having survived his last encounter with the Fantastic Four[2] -- has been released to start his life over. However the Puppet Master is far from cured and seeks to get revenge against the Fantastic Four. After some consideration the Puppet Master decides to use his special clay to make the Sub-Mariner his slave and pit him against their mutual foes. Enslaved, the Sub-Mariner returns to his empty kingdom of Atlantis and uses his Mento-Fish to send out a communication asking Sue to come to him. When meets up with Namor at the docks he kidnaps her and takes her back to his undersea realm. The Puppet Master then forces Namor to contact the Fantastic Four, telling them that he has the Invisible Girl prisoner and taunt them into coming to rescue her. The Puppet Master then boards a sub to watch the battle from close by.

After the Thing picks up his girlfriend Alicia Masters, the Fantastic Four take a sub of their own to the Sub-Mariner's domain. After fighting through the various undersea defenses, Reed, Johnny and Ben confront Namor in his throne room. With Sue trapped in a glass sphere ensnared by an octopus the Fantastic Four square off against the Sub-Mariner. At first the group is kept at by thanks to the various undersea creatures that Namor has at his disposal, however the Thing manages to get past Namor and free Sue, knocking the octopus out into the ocean. When the Puppet Master tries to order the Sub-Mariner to slay his foes, Namor cannot bring himself to harm Sue and fights off the Puppet Master's control.
When the Fantastic Four try to attack Namor again, Sue stands in their way and convinces them to stand down. Meanwhile the octopus ejected from the Sub-Mariner's palace reaches the Puppet Master's sub and crushes the submersible before the villain can put the octopus under his control. Meanwhile, the Sub-Mariner -- still not over his animosity over the surface world -- allows his foes to leave his kingdom.

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