Famous names: Fritz Lang
Crunchy goodness: 5
Spinoffs/sequels/copycats: Arguably this movie spawned an entire class of fembot supervillains, including the ones in Stepford Wives, Eve of Destruction, Terminator 3, and of course Austin Powers.
Design breakthrough: All of the sets and conceptual design in Metropolis were state-of-the-art futurism at the time. The soaring skyscrapers in the city, flying vehicles, elevated roads, and robotics tech were truly visionary, and introduced audiences to urban futurism.
Sight you'll never unsee: The mad engineer bringing robo-Maria to life. This scene has become so iconic that it's been referenced in everything from beer commercials to doctoral dissertations.