When the debut issue of Action Comics, cover-dated June 1938, introduced Superman, it became the first superhero comic book as we know it. Action has been appearing more or less monthly ever since–and sometimes more than monthly. (It was actually weekly for most of 1988.) This week, Action Comics #900 comes to comics stores, making it the first American superhero series to hit that particular milestone, and marking the return of Superman to the title from which he’s been exiled for the past few years. Here’s a gallery of Action‘s previous anniversary issues.