Superman #76 – The Mightiest Team in the World!; The Misfit Manhunter; Mrs. Superman released by DC Comics
“The Mightiest Team in the World!” (Superman, Batman, Robin, Lois Lane and James Gordon) written by Edmond Hamilton, penciled by Curt Swan and inked by John Fischetti. Both Clark Kent and Bruce Wayne book a vacation cruise on a crowded ocean liner and end up sharing a cabin. But when a crime occurs prior to departure, the two discover each others true identities. When it is obvious that the criminal is somewhere aboard the ship, the two crime fighters book passage on the liner as Batman and Superman as well. Unfortunately Lois, who also witnessed the crime, books passage on the cruise too, and Batman and Superman have their hands full trying to uncover the mystery while protecting their secret identities!
In “The Mightiest Team in the World” in Superman #76 (March 7, 1952), Batman and Superman team up for the first time.