FANTASTIC FOUR (1961) #114

At last! This is your chance to learn more about the Over-Mind- one of the most exciting, dangerously different super-foes ever to menace the FF- and all of humanity. The Fantastic Four get their first brush against the Power of Over-Mind, and he bests them right off the bat. Considering them no threat at all, he erases their memory of the battle, and goes about his plan of fulfilling his prophecy. Even without the memory of the battle however, Reed is diligent about examining the warning The Watcher has given them, and gets Agatha Harkness to contact him so they can get the facts about the Over-Mind!