During the post-War years, the popularity of superheroes had declined almost completely, though DC and other publishers were still going strong moving into other genres such as funny animals, romance, Sci-Fi, Westerns and horror. Major characters such as Batman, Wonder Woman and Superman has managed to remain in publication and by the mid-1950s the superhero was again due for a comeback. "Showcase #4" in 1956 introduced readers to Barry Allen, the all-new Flash re-imagined with a sleeker design and steeped much heavier in science fiction (and the older Golden Age heroes being relegated to existing on Earth Two). Characters such as The Atom, Green Lantern and the JSA, now reinvented as the Justice League of America soon followed and a new superhero boom was kicked off.