Metropolis

Sometime in the future, the city of Metropolis is home to a Utopian society where its wealthy residents live a carefree life. One of those is Freder Fredersen. One day, he spots a beautiful woman with a group of children, she and the children quickly disappear. Trying to follow her, he is horrified to find an underground world of workers who apparently run the machinery that keeps the Utopian world above ground functioning