"Mr. Blue" is a 1967 film directed by John Frankenheimer. The story revolves around a group of criminals who plan a heist but face unexpected challenges. The film explores themes of loyalty, betrayal, and the consequences of crime. The main character, known as Mr. Blue, is portrayed by John Cassavetes. As the plot unfolds, tensions rise among the group, leading to dramatic confrontations. The film is noted for its gritty realism and strong performances, making it a significant entry in the crime drama genre.