Pulling back the curtain: Wizard of Oz named most influential film Researchers in Italy have declared the Wizard of Oz the most influential film ever made, outstripping others in how much it has inspired and been referenced in the film industry. The research team came to their conclusion after analysing more than 47,000 films across 26 genres, using references noted in the online movie database IMDb. The authors note that the database is biased towards films from the west, with the majority produced in the US. The team did not consider short films, adult films and those with no link or reference to other movies. They used a combination of four different mathematical approaches to explore the connections between movies, taking into account factors including the number of references a film received and whether the films that referred back to it were themselves influential. The results, presented in the journal Applied Network Science, reveal the top 20 influential films were all made before 1980 – perhaps unsurprising given that older films have had longer to make a mark – with Star Wars and Psycho scooping second and third place respectively. Other high entries include Citizen Kane, Metropolis, Casablanca, Dr Strangelove and Battleship Potemkin.