Metropolis (1927)

Director: Fritz Lang
Writers: Thea von Harbou (screenplay), Thea von Harbou (novel)
Stars: Brigitte Helm, Alfred Abel, Gustav Fröhlich

Somewhere in the future, Metropolis is a wonderful city. High above the ground its towers stand. The people prosper, the economy is flourishing, the suspended streets are busy.
But Metropolis also has a great secret. A secret, so well hidden, that not even Freder Fredersen, son of founder John Fredersen knows about it.
He’s spending his free time in the Eternal Gardens, when suddenly a woman shows up with a group of children. They're from the City of Workers. "These are your brothers", she tells the children, before she is forced to leave.
Freder is so intrigued that he follows them into the depth. He doesn't like what he sees. The workers are exploited, they must do labor like robots.
Freder tries to convince his father to change the system, while the woman tries to keep the workers' morale high by predicting a man will stand up that will mediate. Someone that will use both hands and head.
Someone that will be the heart of Metropolis.