From The Fantastic Four # 2 (1962):
This panel needs a little explanation. The alien Skrulls are intent on conquering Earth and it’s up to the Fantastic Four to stop them.
The heroic quartet rocket into space to the aliens’ mother ship where Mister Fantastic reveals his master plan for thwarting the alien invasion: clippings from comic books.
And that, ladies and gentlemen, is why “Mister Fantastic am jenius”.