Fantastic Four #1 (November 1961)

Jack Kirby's cover for the issue that started the Marvel Universe. The team has no costumes yet: Reed is tied up in ropes, Sue is fading out in the monster's grip, and the Torch and the Thing go at it from either side, all in street clothes. The blue box promising all four "together for the first time" sells the idea of a superhero family before the book even opens. Inside, the team gets its origin and fights the Mole Man.