Who Was Behind the Zero Day Attack? The Explosive Ending Explained

Netflix‘s political thriller Zero Day wraps up its six-episode run with a shocking twist that leaves viewers questioning everything.

The finale reveals the true masterminds behind the deadly cyberattack that rocked the nation and explores the mysterious weapon, Proteus, which George Mullen (Robert De Niro) believed targeted him.

The Cyberattack Unraveled

In the final episode, the Zero Day Commission uncovers the real culprits behind the cyberattack that killed over 3,400 Americans. Initially, the investigation pointed to Monica Kidder (Gaby Hoffman), the CEO of Panoply, who was believed to have deployed the malware as revenge for the Federal Trade Commission’s investigation. But Kidder’s death in prison raised suspicions.

As the story unfolds, it becomes clear that the Zero Day attack was orchestrated by none other than Speaker Richard Dreyer (Matthew Modine), along with Rep. Alexandra Mullen (Lizzy Caplan) and other government officials. Their plan, initially meant to cause fear and show the country’s vulnerability, spiraled out of control.

George Mullen’s Dilemma

In the series’ dramatic final moments, George Mullen must decide between exposing the government conspiracy and protecting his own family. While George initially seems ready to stay silent, an emotional moment during his speech to Congress forces him to reveal the truth. He names Dreyer and his co-conspirators, shocking the nation.

However, George’s daughter, Alex, was already prepared to turn herself in, having left a letter for her father explaining her decision to confront the truth.

Proteus: A Mysterious Weapon

Throughout the series, George is plagued by symptoms that suggest he might be targeted by a neurological weapon known as Proteus, originally developed by the CIA. This weapon could cause traumatic brain injuries from a distance.

While George suspects he’s been attacked by Proteus, the investigation remains inconclusive, leaving viewers wondering whether it’s a real threat or just a result of George’s stress.

What’s Next for George?

With the truth exposed, George steps away from the Zero Day Commission and returns to his quiet life in upstate New York. He reflects on his journey, abandoning his memoir, and finds a moment of peace by the Hudson River.

Is There a Zero Day Season 2?

Zero Day was created as a limited series, and with its story wrapped up, there are no indications of a second season. The series ends on a reflective note, leaving George’s future uncertain, but with justice for the victims of the cyberattack.