At the start of this high-stakes Netflix limited series Zero Day, former U.S. president George Mullen (played by Robert De Niro, in case you missed it) comes out of retirement when a massive cyberattack rattles the country. He’s thrown into a disorienting world where facts are blurry, disinformation reigns, and his own mind seems to be betraying him. What he uncovers? It’s way worse than he could’ve imagined — because the people behind this monumental attack are closer to him than he thought. Plot twist: The culprits? Key figures from the U.S. government itself, including Speaker of the House Richard Dreyer (Matthew Modine), Mullen’s daughter Alex (Lizzy Caplan), and some seriously influential billionaires.

In the face of this personal, professional, and national betrayal, here’s the dilemma that has the internet buzzing: Does Mullen go full “protect the nation” mode and hide the truth, or does he rip the bandaid off and expose everything — even if it means losing his daughter in the process? With the weight of the world on his shoulders, Mullen does something we didn’t see coming: He ditches the script, rejects the sanitised version of events, and drops the truth bomb on live TV. It’s brutal, heartbreaking, and real. No punches pulled. The chaos that follows in the House Chamber? Chef’s kiss.

After Mullen drops the bombshell on live TV, he retreats to his secluded estate, grabs his memoir draft, and tosses it in the fire. No more polishing his legacy with polished words —his decision to speak the brutal truth has already defined him. We can hope our IRL politicians take a page from this fictional book.

[Spoiler alert, because we’re about to dive into the truth behind Zero Day’s mind-blowing finale.]

Unpacking the Zero Day attack

This cyberattack wasn’t about money. It wasn’t about revenge. Oh no, these high-ranking politicians and billionaires were all about uniting the fractured nation under one common cause. Speaker Dreyer, desperate to break the legislative gridlock and unite a divided America, masterminds the whole thing. Caplan and Modine, who played Alex and Dreyer, knew from day one that their characters were the culprits. So, if you rewatch the show knowing they’re behind the attack, does it hit differently? You bet it does.

Proteus, the terrifying cyber weapon that makes the Zero Day attack possible, was created by the National Security Agency. Proteus isn’t your average malware. It’s designed to inflict trauma to the brain from a distance, cleverly modified to spread through the most unsuspecting channels – phone updates, Bluetooth, USBs. The malware jumps from device to device like a digital plague, just as tech billionaire Monica Kidder (Gaby Hoffmann) intended.

As for Mullen’s mind-bending hallucinations, we could blame the Proteus weapon, but honestly? It’s up for debate. The former President’s loosening grip on reality could be a side effect of the tech, but it could also be a natural reaction to a high pressure situation such as this.

The show gives us a hard look at how a divided nation might respond to a massive cyberattack today, and let’s just say... it’s not the unifying response we hope for. Only time will tell if we’ll see a real-life Zero Day, but one thing’s for sure: this show gives us plenty to think about. And if you didn’t already feel like you were living in a digital nightmare, this series will definitely give you some new fears.