The Infiltrator’s ending sees Robert Mazur’s years of undercover work come into effect with a major bust, leading to questions about the real-life history and the film’s thematic implications. Bryan Cranston leads The Infiltrator cast, playing the dual lives of Robert Mazur and his undercover criminal counterpart, Bob Musella. As Musella, he helps drug lords of the cartel with laundering their money, hoping to gain favor and infiltrate their ranks, bringing him closer to higher-ups like Pablo Escobar.