Superman #76 (1952)

In Superman #76, we witness a groundbreaking moment in comic book history - the first time ever that Superman and Batman learn each other's true identities. Written by the legendary Edmond Hamilton with artwork by Curt Swan and John Fischetti, "The Mightiest Team in the World!" takes us on a thrilling ride as the two superheroes find themselves on a cruise trying to track down a diamond thief. But when a crime occurs before the ship even sets sail, the two discover each other's secret identities and team up to solve the mystery. To make matters more complicated, Lois Lane also books passage on the cruise, forcing Batman and Superman to protect their true identities while trying to solve the crime. Along with this epic first-ever team-up story, the issue also includes "The Misfit Manhunter" written by Bill Finger, "Mrs. Superman" written by Bill Woolfolk, and a full text story called "The Gatling Gun." Trust us, this is one classic issue you don't want to miss. And hey - you just might learn a thing or two about comic book history in the process!