Season guide

Zero Day: Limited Series

6 episodes Premiered Feb 20, 2025 Updated Jul 21, 2026

Season 1 Episodes

Episode Guide

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Mytharc (3): Crucial lore & season climaxes

Core (3): Character development & subplots

Side Quest (0): Standalone / filler

S1·E1 Mytharc

Feb 20, 2025 · 50 min

Former President George Mullen's comfortable retirement is upended after he's asked to lead an investigation into a horrific cyberattack.

S1·E2 Core

Feb 20, 2025 · 59 min

Mullen's commission investigates a hacking ring. President Mitchell weighs retaliation. A powerful figure has demands for Roger.

S1·E3 Core

Feb 20, 2025 · 51 min

Mullen's initial arrests draw blowback from the public — especially TV pundit Evan Green. Alex faces pressure to investigate her father.

S1·E4 Core

Feb 20, 2025 · 54 min

A shock to the financial system increases scrutiny on Mullen's commission. Valerie investigates Proteus. Roger must make a difficult choice.

S1·E5 Mytharc

Feb 20, 2025 · 44 min

A personal tragedy reopens old wounds for the Mullen family. Speaker Dreyer pushes for a change in leadership. Sheila testifies before Congress.

S1·E6 Mytharc

Feb 20, 2025 · 54 min

A new threat creates further unrest across the nation. As he narrows in on the culprit, Mullen is faced with an agonizing decision.