Films, sometimes, are the subjects of real cults, with their churches, their apostles and the rites that accompany them. Spectators turn into fans, communities that come together and share their passions. However, most of the time these films are "nonsense", "Z" series which despite everything find their audience and forever mark the history of pop culture. So bad it's good, through documented interviews and numerous extracts from cult films such as The Room, The Rocky Horror Picture Show, including Showgirls, sets out to discover this singular cult for these films so bad that they become good. Nanars, masterpieces, or both? Through these unusual sociological demonstrations, which unfailingly bring together thousands of spectators around the world, all the unalterable power of cinema is revealed.