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.

Hugo Danner is a fictional character and the protagonist of Philip Wylie's 1930 novel Gladiator. Born in the late 19th century with superhuman abilities via prenatal chemical experimentation, Danner tries to use his powers for good, making him a precursor of the superhero. However, Danner grows disillusioned with his inability to find a permanent outlet for his great strength, and dies frustrated.