In mid-1961, following rival DC Comics' successful revival of superheroes a few years earlier, Goodman assigned his comics editor, Stan Lee, to follow the trend again. He said, "Stan, we gotta put out a bunch of heroes. You know, there's a market for it." Lee's wife suggested that Lee experiment with stories he preferred, since he was planning on changing careers and had nothing to lose. In response, Lee and artist Jack Kirby created "The Fantastic Four" #1 (cover-dated Nov. 1961), giving their superheroes a flawed humanity in which they bickered, worried about money and behaved more like everyday people than noble archetypes. That series became the first major success of what would become Marvel Comics. The newly naturalistic comics changed the industry. Lee, Kirby, such artists as Steve Ditko, Don Heck, Dick Ayers, John Romita Sr., Gene Colan, and John Buscema, and eventually writers including Roy Thomas and Archie Goodwin, ushered in a string of hit characters, including Spider-Man, Iron Man, the Hulk, Daredevil, and the X-Men.