Action Comics #1 (June 1938) is the first issue of the original run of the comic book series Action Comics. It features the first appearance of several comic book heroes—most notably the Jerry Siegel and Joe Shuster creation, Superman. For this reason it is widely considered both the beginning of the superhero genre and the most valuable comic book of all time.

After investigating Alex Greer, Superman finds those responsible for instigating war in Europe. This is a Superman-only issue.

Superman investigates a possible conspiracy behind a mine collapse that may be deeper than the mine itself. This is a Superman-only issue.

Dressed as a collegiate football player, Superman uncovers a dirty plot his rivals are using to cheat. This is a Superman-only issue.

Featuring the first appearance of a certain bow-tie wearing cub reporter. Although credited as "office boy," this story cites the first appearance of Superman's Pal Jimmy Olsen, who becomes a major character within the Superman mythos.

Superman answers an ad from a wealthy industrialist who’s looking for help with his gambling-addict son in "Carnahan's Heir."

A surprise snowstorm hits Metropolis—in the middle of summer!

“FIFTH COLUMNISTS!” Lois Lane goes to Gladstone Hall to cover a meeting of the "Volunteers for Peace.” All is not as it seems though, as Superman discovers a plot by the Volunteers to sabotage several key targets to soften up Metropolis for an invasion by "Nation X"!

“CLARK KENT, POLICE COMMISSIONER!” The criminal element of Metropolis is killing every police commissioner appointed, and Clark sees a connection between the criminal element and certain crooked politicians. But Clark is dumbfounded when it is suggested he take the job to crack down on that criminal element.