The author, an ethical hacker, reviews the Netflix series Zero Day with a critical eye as someone who works with Bugcrowd to find and fix vulnerabilities in software and systems. While the show's depiction of a massive-scale zero-day attack was unrealistic, the author notes that individual attacks are possible, especially if hackers target remote code execution or command and control systems. The author also highlights how convenience and data sharing can lead to security challenges, such as devices being vulnerable to hacking due to lack of proper inspection or backdoor threats. Ultimately, while a massive-scale attack like in Zero Day is unlikely, the author believes that advanced threat actors with insider help could make it happen, and that AI will play a significant role in future attacks.