Category III: The Untold Story of Hong Kong Exploitation Cinema Until the end of the nineties, the Hong Kong cinema that explored the limits of sex and violence without shame was labeled "category III". Calum Waddell's new documentary, an exhaustive investigator of the mysteries of genre film, is immersed, through interviews and archival images, in one of the most wild and exciting popular film cycles.

三级片：香港剥削电影不为人知的故事是由卡鲁姆·瓦德尔执导，陈翊恒,甘国亮,何志强,何超仪,龙比意,黄秋生,卡鲁姆·瓦德尔主演的理论片，在2018年上映播出，青苹果影院提供了三级片：香港剥削电影不为人知的故事在线观看，并且还可以支持手机看，不需要下载播放器,方便广大影迷。