Riki-Oh: The Story of Ricky (also known as Riki-Oh: The Story of Ricky or 力王 ) is a legendary Hong Kong cult action film directed by Lam Nai-choi, based on the manga Riki-Oh by Masahiko Takajo and Saruwatari Tetsuya. Famous for its extreme over-the-top gore, martial arts, and dark dystopian prison setting, this movie has gained a massive following worldwide.