The Justice League, or Justice League of America (JLA), are a group of superheroes appearing in American comic books published by DC Comics. The team first appeared in The Brave and the Bold #28. Writer Gardner Fox conceived the team as a revival of the Justice Society of America, a similar team from DC Comics from the 1940s which had been pulled out of print due to a decline in sales. The Justice League is an all-star ensemble cast of established superhero characters from DC Comics' portfolio. Diegetically, these superheroes usually operate independently but occasionally assemble as a team to tackle especially formidable villains. This is in contrast to certain other superhero teams such as the Doom Patrol or Marvel’s X-Men whose characters were created specifically to be part of the team, with the team being central to their identity. The cast of the Justice League usually features a few highly popular characters who have their own solo books, such as Superman, Batman, Wonder Woman, The Flash, Green Lantern and Aquaman alongside several lesser-known characters who benefit from exposure.