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"In the somewhat distant future (some editions say the year 2000, others place it in 2026, and, still others — including the original Paramount U.S. release — in 3000 A.D.) the city of Metropolis, with its huge towers and vast wealth, is a playground to a ruling class living in luxury and decadence. They, and the city, are sustained by a much larger population of workers who labor as virtual slaves in the machine halls, moving from their miserable, tenement-like homes to their grim, back-breaking ten-hour shifts and back again. The hero, Freder (Gustav Froehlich) — the son of Joh Fredersen (Alfred Abel), the master of Metropolis — is oblivious to the plight of the workers, or any aspect of their lives, until one day when a a beautiful subterranean dweller named Maria (Brigitte Helm) visits the Eternal Gardens, where he spends his time cavorting with various ladies, with a small group of children from the workers' city far below. They are sad, hungry, and wretched looking, and he is haunted by their needy eyes — something Freder has never seen or known among the elite of the city — and by this strange and beautiful woman who tells all who hear her, workers' children and ruler's offspring, that they are all brothers. He follows her back down to the depths of the city and witnesses a horrible accident and explosion in the machine halls where the men toil in misery. Haunted by what he has seen, he tries to confront his father, only to find that the man he loves and respects believes that it is right for the workers to live the way they do, while he and his elite frolic in luxury.

Freder decides to do something about it, but he must first learn more, and also locate Maria. With help from Josaphat (Theodor Loos), Fredersen's recently dismissed office manager, he goes below again and takes over the job of one of the workers, in order to find Maria. Meanwhile, Fredersen is concerned about the rumblings of unrest among the workers, and his son's sudden interest in their plight; he assigns "Slim" (Fritz Rasp), his investigator, to follow Freder. Meanwhile, he goes for advice to an old acquaintance, the inventor C.A. Rotwang (Rudolf Klein-Rogge). Rotwang once was a rival to Fredersen for the love of the woman Hel, who married Fredersen and died bearing his son, Freder. Rotwang still feels the loss, but he is a cunning and practical man, and is willing to help his old "friend," but not before showing off his latest creation — a robot that he has modeled in the image of his beloved Hel, that he may have her again. Rotwang answers Fredersen's question by taking him to the catacombs below the modern city, where they see Maria preaching the gospel and counseling patience, in the hope that a "Mediator" — who will be able to reconcile the "head" and "hands" of society (i.e. the ruling and working classes) — will come among them.

Fredersen will hear none of it, and sees the need to break the workers' resistance and destroy Maria's influence among them. He arranges with Rotwang to make his robot creation into a duplicate Maria (which requires his kidnapping her), and to send her out among the workers to incite them to violence, so that Fredersen can use force against them. But he doesn't reckon with Rotwang, who despises Fredersen and his ruling class, and has commanded the robot to obey his orders and follow a plan that will destroy the city, both above and below ground. Fredersen also doesn't reckon with his own son Freder, who not only believes in what Maria is preaching but is beginning to see himself as the "Mediator," and is right in the midst of the conflagration when the workers' uprising starts. Soon, fires and floods spread, threatening to doom the children of the workers, abandoned in their parents' frenzied attack on the machines, and the city of Metropolis faces an impending disaster of biblical proportions. Meanwhile, the now-mad Rotwang tries to reclaim his lost Hel, and Maria and her evil robot twin are both stalked by crowds of workers driven to a murderous rage.

When it was premiered in Germany in January 1927, Metropolis ran 153 minutes when projected at 24 frames per second. That complete version was heavily cut for release in America, removing a quarter of the movie — this included the personal conflict between Fredersen and the Rotwang over a woman; a subplot involving double-dealing, espionage, and the mysterious "Slim"; a section taking place in the "red-light" district of the city; a good deal of the symbolism in the movie's original dialogue; and a large chunk of the chase at the end. In Germany in the spring of 1927, an edited version modeled roughly on the American edition, though running slightly longer, was prepared and released, and that became the "standard" version of the movie, for both domestic (i.e. German) distribution and export. In subsequent years, other editions were circulated and still others were found deposited in various archives; in a surprising number of instances — including that of a source stored at the Museum of Modern Art in New York — there were tiny fragments to be found of the lost, longer version of Metropolis.

The movie's reputation was further compromised with the lapsing of its American copyright in 1953, after which countless copies and duplicates, in every format from 8 mm to 35 mm (and, later, VHS tape and DVD) came to be distributed in the U.S. by anyone who could lay their hands on a print, of whatever quality and with whatever music track they chose (or didn't choose) to put on it. While several versions of the movie from these sources — each with plot elements missing from the synopsis — circulated, various restorations of the movie were attempted over the decades by responsible parties, as well. The BBC did a very effective one in the mid-'70s that was a hit on public television in America, utilizing an electronic music track that sometimes mimicked some of the industrial images on the screen. Also, there was the Giorgio Moroder version from 1984, heavily tinted and re-edited, with a rock score grafted onto it, which introduced the movie to a whole new generation of fans and turned it into a modern pop-culture fixture."