House ad for "America's Greatest Comics Characters" (1949); printed in Batman #51 (February-March 1949)
In the Great Hall of the Justice League...there are assembled the world's greatest heroes...created from the cosmic legends of the universe! Superman! Wonder Woman! Batman and Robin! The Flash! Green Lantern! And those three junior Super Friends: Mutt, Jeff and Brooklyn! Their mission: to fight injustice, to right that which is wrong, and to serve all mankind!