Iron Munro is a superhero character appearing in American comic books published by DC Comics. Roy Thomas created the character in 1987 for Young All-Stars. He largely served to replace Superman in stories set during World War II after the Crisis on Infinite Earths storyline eliminated continuities in which Superman was active in this period.

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.