Justice League International #24

The second anniversary of the "World's Greatest Non-Mutant Super-Hero Team" gets a fittingly packed celebration in this February 1989 milestone, with cover art by Kevin Maguire and Joe Rubinstein assembling the full roster — Wonder Woman, Batman, Green Lantern, The Flash, Martian Manhunter, Blue Beetle, Booster Gold, and many more — in one sprawling group portrait. The Flash's deadpan speech bubble asking "Who let these guys in?" perfectly captures the irreverent humor that made this Giffen and DeMatteis run so distinctive. It's a warm, confident snapshot of a team at the height of its personality-driven charm.