What Metropolis is
Metropolis is the city Superman protects, and the original model for the optimistic superhero metropolis. It is first named in Action Comics #16, cover-dated September 1939, by Superman’s creators Jerry Siegel and Joe Shuster. That date is later than most people expect. Superman had already been running for more than a year, since Action Comics #1 in 1938, and through all of those early stories his city had no name at all. #16 is the issue that fixed it, turning a generic big city into Metropolis and giving the Superman world a permanent address.
The naming was almost an afterthought, but it stuck completely. Once the city had a name, it could become a character: a place with its own skyline, its own newspaper, and its own civic optimism. Every later piece of Superman lore, the Daily Planet, Lois Lane’s byline, Lex Luthor’s corporate towers, hangs off the decision made in #16 to call the place Metropolis.
Where the name came from
The name is a borrow. Siegel and Shuster took “Metropolis” from Fritz Lang’s 1927 silent film of the same title, a German science-fiction landmark about a towering future city. The choice tells you what the creators wanted the place to feel like: forward-looking, vertical, a city of tomorrow rather than a real town on a map. The early plan had been different. When Siegel and Shuster first tried to sell Superman as a newspaper strip, they leaned on real settings, but for the comic books they switched to a fictional city, and the Lang film handed them a name that matched Superman’s tone.
The look followed a more personal route. Joe Shuster modeled the early Metropolis skyline on Toronto, the city where he was born and lived as a boy, before decades of artists gradually reshaped it into the New-York-flavored skyline readers know now. So the city carries two real places inside it, a Canadian childhood and an American myth, fused under a German movie’s name.
The city as a character
What separates Metropolis from a generic backdrop is how much of Superman’s supporting cast is built into it. The Daily Planet and its globe are Metropolis landmarks. Lois Lane and Clark Kent work its streets as reporters. Lex Luthor runs it from the top of a tower, the corrupt civic power that Superman’s clean ideal is measured against. The city is where Superman is most himself, not because it is dangerous, but because it is worth protecting.
Metropolis and Gotham
Metropolis only fully makes sense next to its opposite. DC built Gotham City and Metropolis as a matched pair, the two faces of the same idea. Metropolis is bright, glass, daytime, and hope; Gotham is gothic, shadowed, nighttime, and fear. The shorthand DC writers reach for is that Metropolis is New York by day and Gotham is New York by night. The contrast is the point. Superman needs a city optimistic enough to deserve him, the same way Batman needs a city broken enough to require him.
Why it endures
Metropolis lasted because it was the first of its kind and never needed fixing. It established the template that nearly every superhero city since has copied: a named, characterful home base that reflects its hero’s values. The fact that the name arrived a full year into Superman’s run, almost casually, is the quiet surprise. Action Comics #16 is not a famous key the way #1 is, but it is the issue where Superman stopped living in an anonymous city and started living in Metropolis, and the place has been the bright center of the DC universe ever since.