The Silver Age of comic books is generally considered to date from the first successful revival of the dormant superhero form—the debut of Robert Kanigher and Carmine Infantino's Flash in Showcase No. 4 (September/October 1956). The Silver Age lasted through the late 1960s or early 1970s, during which time Marvel Comics revolutionized the medium with such naturalistic superheroes as Stan Lee and Jack Kirby's Fantastic Four and Stan Lee and Steve Ditko's Spider-Man.