Superman of Earth-Two is an alternate version of the fictional superhero Superman, who appears in American comic books published by DC Comics. The character was introduced after DC Comics created Earth-Two, a parallel world that was retroactively established as the home of characters whose adventures had been published in the Golden Age of comic books. This allowed creators to publish Superman comic books taking place in current continuity while being able to disregard Golden Age stories, solving an incongruity, as Superman had been published as a single ongoing incarnation since inception. This version of the character first appeared in Justice League of America #73.

The All-Star Squadron is a DC Comics superhero team that debuted in Justice League of America #193 and was created by Roy Thomas, Rich Buckler and Jerry Ordway. Although the team was introduced in the 1980s, its self-titled series took place in the 1940s, retroactively inserting their narratives into the fictional history of the DC Comics superheroes. The team included many of DC's Golden Age era characters, new characters, and other World War II superheroes that DC did not own during the 1940s but later acquired. The name "All-Star Squadron" was creator Roy Thomas' reference to All Star Comics, the series that introduced the Justice Society of America, the first comic book superhero team.