Lost scenes from the sci-fi classic "Metropolis," recently discovered in the archives of a Buenos Aires museum, were shown to journalists for the first time in decades on Thursday.

A long-lost original cut of the 1927 silent film sat for 80 years in a private collection and then in the Museum of Cinema in Buenos Aires, where it was discovered in April with scratched images that hadn't been seen before.

Museum director Paula Felix-Didier said theirs is the only copy of German director Fritz Lang's complete film.

"This is the version Fritz Lang intended," said Martin Koerber, a curator at the Deutsche Kinemathek film museum in Berlin, Germany.

"Metropolis," written by Lang and his actress wife Thea von Harbou, depicts a 21st century world divided between a class of underworld workers and the "thinkers" above who control them.

distributors cut Lang's three-and-a-half-hour masterpiece into the shorter version since viewed by millions worldwide.