Lee and freelance artist and eventual co-plotter Jack Kirby's Fantastic Four originated in a Cold War culture that led their creators to revise the superhero conventions of previous eras to better reflect the psychological spirit of their age. Eschewing such comic-book tropes as secret identities and even costumes at first, having a monster as one of the heroes, and having its characters bicker and complain in what was later called a "superheroes in the real world" approach, the series represented a change that proved to be a great success.
Who joined with Stan Lee in creating the Fantastic Four? What historic era did the Fantastic Four initially inhabit? What traditional superhero element did the Fantastic Four initially do without? None of the Fantastic Four had what hidden element so common to other superheroes? The emphasis on relatable settings and character motivations in Marvel's 1960s comics is called what?