FANTASTIC FOUR (1961) #10

This issue opens on Mr. Fantastic using an electronic x-ray camera to take photos of the Invisible Girl in the hopes of finding out the way in which she turns invisible. As he’s studying the photo, the Fantastic Four’s emergency flare shoots outside the window, and he figures that it must be the Thing, as he’s the only member of the Fantastic Four not at the Baxter Building at that time. Mr. Fantastic, the Invisible Girl, and Human Torch all leave the Baxter Building, and head for where the flare came from, whilst avoiding their fans, who all want autographs.…