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At the start of this issue, the Fantastic Four are discussing the X-Men. Meanwhile, the Puppet Master and Mad Thinker are meeting up, as the Mad Thinker has a plan that will stop the Fantastic Four. He orders the Puppet Master to create a puppet of the X-Men's leader, and using the Thinker's exact calculations, manages to create a puppet of Professor X which can control him. Professor X then tells the X-Men to capture the Fantastic Four. Since they don't realise Professor X is being controlled, they obey him and fly their helicopter to the Baxter Building. Upon going into the building and greeting the Fantastic Four, they get mentally told by Professor X to capture them. The X-Men battle the Fantastic Four, but it's a stalemate until the X-Men capture Sue Storm and take her to an island the Professor told them about. When there, the Fantastic Four are caught by various traps on the island, for example a massive pit for the Thing to fall into. The Mad Thinker and Puppet Master then arrive, and are ready to command Professor X to subdue the X-Men. However, just before succumbing to the command, Beast manages to smash the puppet of Professor X. He then also gets knocked out. Meanwhile, the Thing manages to escape from the pit by diggging handholds in the wall, and frees the other members of the Fantastic Four. Together, they and the X-Men then are forced to fight the Mad Thinker's android, but can't do anything to it. Before they are destroyed, Professor X, miles away, uses his mental powers to shut the android down. The Mad Thinker and Puppet Master then escape, and the X-Men apologise to the Fantastic Four for fighting with them.