Fantastic Four (1961) 28-A

"We Have to Fight the X-Men!"

Professor X's mind has been taken over by the evil Puppet Master as he orders his X-Men to take down the FF. The X-Men arrive at the Baxter Building and neutralize the FF and they take Sue as a hostage. The FF pursue the X-Men as they lead them to a strange plateau where they battle again but not before the Puppet Master and the Thinker reveal themselves as the ones behind the fight. With the help of the FF, the X-Men battle the Awesome Android and defeat the plans of the Thinker, who escapes with the Puppet Master. The X-Men return to the school as the FF head back home.