During his investigation of the attack, Mullen discovers the name Proteus.

However, it is only much later in the miniseries that the true purpose of Proteus is revealed.

Was Proteus Used for the Cyberattack in ‘Zero Day’?

Robert De Niro as George Mullen in ‘Zero Day’

Custom Image by Nimesh Perera

After returning to public life,Mullen starts facing psychological problems, which include random hallucinations and flashbacks.

He keeps hearing the 1980 Sex Pistols song “Who Killed Bambi?”

for reasons that are tragically revealed in Episode 4.

Robert De Niro as George Mullen and Connie Britton as Valerie Whitesell in ‘Zero Day"

Image via Netflix

When Mullen tries to recall parts of his conversation with Natan, the word Proteus pops up in memory.

What Is Proteus in Netflix’s ‘Zero Day’?

In Episode 4, Valerie tracks down one of the scientists who originally worked on the NSA program.

With-the-Way-Things-Are,-a-‘Zero-Day’-Scenario-Is-More-Likely-Than-You-Think-

‘Zero Day’ might be a work of fiction, but the Netflix series is all too real.

According to the scientists, it is not possible to trace the origin of the injury inflicted by Proteus.

Was Proteus Used To Attack George Mullen?

Robert De Niro in Zero Day key art

Image via Netflix

This information might create some suspicion about the gadget found in the birdfeeder.

However,another small, easy-to-miss detail lies in this scene from Episode 1.

unnamed-4.jpg

instar53337330.jpg

instar53745323.jpg

zero day

Robert De Niro