Five prisoners - Teapot, Curly, Exhaust Pipe, Vaseline, and Rookie meet in their cell to form a friendship. Rookie assumes the leadership of the group, whilst Teapot is bullied by the others (in the later films, Roundhead, played by Eric Tsang, is the group's victim and Hung's character is the leader). Following their release, they team up with Curly's beautiful sister, Shirley, and form a company called the Five Stars Cleaning Co. While most of the group attempt to vie for Shirley's affection, Teapot ultimately forms a relationship with her.