New villain Phillip Masters aka the Puppet Master doesn't approve of the marriage of his step-daughter Alicia Masters & Ben Grimm aka the Thing. So he teams up with another new villain the Mad Thinker & Mastermind of the Brotherhood of Mutants by manipulating them & the X-Men into fighting each other. Eventually the Fantastic Four & the X-Men see through their ruse and must team up to stop the villains. (Based on Fantastic Four Vol. 1 #28)
