Adventure Comics #311

The Legion of Substitute Heroes throws down the gauntlet in this August 1963 issue of Adventure Comics, as Polar Boy — shown confronting a large display board featuring portraits of Superboy, Shrinking Violet, Cosmic Boy, Saturn Girl, Bouncing Boy, Chameleon Boy, Triplicate Girl, Ultra Boy, Star Boy, Sun Boy, Brainiac 5, Colossal Boy, Element Lad, Invisible Kid, and Lightning Lass — dramatically accuses the Legion of Super-Heroes of plotting to conquer Earth. Curt Swan and George Klein's cover sets the stage with crisp, colorful energy, pitting two full rosters against each other in a conflict that promises plenty of super-powered drama. Writer Edmond Hamilton and artist John Forte deliver what looks to be one of the most ambitious Legion tales of the era.