Zero Day is Netflix’s six-episode 2025 limited political thriller starring Robert De Niro as former U.S. president George Mullen. Released on February 20, 2025, the series follows Mullen after a devastating cyberattack as he leads a national investigation that reaches into government, media, technology and his own family. All six episodes are available on Netflix, subject to regional availability.
This guide begins spoiler-free with the principal cast and their roles, then explains the character relationships and ending reveals. Spoilers begin in the clearly marked section below.
Zero Day at a glance
| Title | Zero Day |
|---|---|
| Platform | Netflix |
| Format | Limited series |
| Genre | Political thriller and conspiracy thriller |
| Release date | February 20, 2025 |
| Episodes | Six |
| Episode runtimes | 49, 59, 50, 53, 43 and 53 minutes |
| Rating | TV-MA |
| Language | English |
| Creators | Eric Newman, Noah Oppenheim and Michael S. Schmidt |
| Director | Lesli Linka Glatter, who directed all six episodes |
| Lead | Robert De Niro as former President George Mullen |
These format and viewing details come from the official Netflix title page and Netflix’s cast and character guide.
Principal Zero Day cast: actor and character guide
Netflix’s promotional cast list is shorter than a full credit listing. The table below therefore identifies the principal ensemble and the most important recurring players rather than claiming that 14 names represent every credited performer.
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| Actor | Character | Spoiler-light role |
|---|---|---|
| Robert De Niro | George Mullen | A popular former U.S. president recruited to lead the Zero Day Commission after a catastrophic cyberattack. |
| Jesse Plemons | Roger Carlson | Mullen’s former aide and political fixer, who wants to regain access to national power. |
| Lizzy Caplan | Alexandra “Alex” Mullen | Mullen’s congresswoman daughter, determined to establish a political identity separate from her father. |
| Connie Britton | Valerie Whitesell | Mullen’s former chief of staff, brought back to organize and supervise the commission. |
| Joan Allen | Sheila Mullen | Mullen’s wife, a former first lady and federal judicial nominee with a legal career of her own. |
| Bill Camp | Jeremy Lasch | The fictional CIA director, whose motives and loyalty are difficult to determine. |
| Dan Stevens | Evan Green | A wealthy, divisive political television host and Mullen’s most prominent public critic. |
| Matthew Modine | Richard Dreyer | The fictional Speaker of the House, outwardly confident but deeply calculating. |
| Angela Bassett | President Evelyn Mitchell | The sitting president who appoints Mullen to lead the investigation. |
| McKinley Belcher III | Carl Otieno | A Department of Justice lawyer and lead investigator for the commission. |
| Gaby Hoffmann | Monica Kidder | A controversial Silicon Valley billionaire whose technology becomes important to the investigation. |
| Clark Gregg | Robert Lyndon | A Wall Street billionaire, corporate raider and political provocateur. |
| Mark Ivanir | Natan | An intelligence operative and longtime Mullen confidant. |
| Mozhan Navabi | Melissa Kornblau | The Zero Day Commission’s communications director and public-relations chief. |
The character descriptions are based primarily on Netflix Tudum’s official cast guide, supplemented for the broader credit list by TV Guide’s cast listing.
The main characters in detail
Robert De Niro as George Mullen
George Mullen is the center of Zero Day. A respected former president, he has stepped away from public life when President Evelyn Mitchell asks him to return and lead the Zero Day Commission. His authority gives the investigation unusual reach, but his position also makes every decision political.
Mullen is dealing with more than official pressure. He is grieving the death of a son from a drug overdose, facing attacks from political opponents and media figures, and experiencing episodes that make him question whether his perceptions can be trusted. The character’s investigation is therefore both national and personal: he is trying to discover who caused the attack while determining whether he can still rely on his own judgment.
For De Niro, the part is significant but should be described accurately. Netflix calls it his first starring television-series role, not his first television acting appearance of any kind. He also served as an executive producer and was involved in the project’s development. See Netflix’s cast feature and De Niro’s Tudum interview.
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Roger Carlson is Mullen’s former aide and a political fixer who knows how power works behind the scenes. He helps connect the former president to the older political network surrounding the commission, while also maintaining relationships with wealthy and influential people outside government.
Roger is not simply a loyal assistant. His desire to return to the center of national politics gives him an independent agenda and makes his access to Mullen both useful and potentially dangerous. Plemons said he used Doug Band, Bill Clinton’s former body man and aide, as one reference point for the character. That is acting research, not evidence that Roger is directly based on Band.
Lizzy Caplan as Alexandra “Alex” Mullen
Alexandra Mullen is a New York congresswoman and George and Sheila Mullen’s daughter. She is frustrated by congressional paralysis and wants to build a political career that is not defined solely by her father’s presidency.
Her central conflict is the tension between independence and family loyalty. Alex scrutinizes the commission as a political figure while remaining emotionally tied to the man leading it. The opening episodes present her as a daughter trying to escape a powerful legacy; later episodes add a much darker dimension to that relationship. Her full role is discussed in the spoiler section.
Connie Britton as Valerie Whitesell
Valerie Whitesell is Mullen’s former chief of staff and one of the people he trusts most. She returns to public life to help assemble, organize and supervise the Zero Day Commission.
Valerie’s relationship with Mullen is more complicated than a conventional former-president-and-chief-of-staff partnership. The series eventually establishes that her connection to the Mullen family is also personal and familial, not just professional. That later revelation changes how viewers understand her loyalty and the cost of the investigation.
Joan Allen as Sheila Mullen
Sheila Mullen is George’s wife, a former first lady and a nominee for a federal judgeship. She is also an experienced lawyer and mother with ambitions and professional judgment of her own.
Sheila is not written as a passive political spouse. She understands the legal and personal consequences of George’s choices and often provides a pragmatic counterweight to his increasingly consuming investigation. Netflix’s behind-the-scenes material describes Sheila as the show’s conscience; that is a creator’s interpretation of the character rather than an official job title.
Bill Camp as Jeremy Lasch
Jeremy Lasch is the fictional director of the CIA. He represents the intelligence establishment and is one of the series’ most ambiguous government figures.
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Lasch may be a dangerous adversary, a valuable ally or both, depending on which part of the investigation is under discussion. His presence keeps Mullen’s commission from operating as an independent political inquiry: intelligence agencies have their own information, interests and limits.
Dan Stevens as Evan Green
Evan Green hosts a popular political television program and becomes Mullen’s loudest public critic. He embodies the overlap between political commentary, entertainment, wealth and disinformation.
Green presents himself as a voice for ordinary citizens despite his wealth and influence. The character is calculating and divisive, but the show uses him for more than comic or media-villain purposes: his broadcasts help shape what the public believes about the attack and about Mullen himself.
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Matthew Modine as Richard Dreyer
Richard Dreyer is the fictional Speaker of the House. He projects a folksy, confident manner while operating as a highly experienced political strategist.
Dreyer matters because the attack occurs in a political system already marked by division and legislative gridlock. His position gives him influence over the national response, the commission’s political environment and the public story surrounding the crisis. His deeper involvement is a major late-series spoiler.
Angela Bassett as President Evelyn Mitchell
President Evelyn Mitchell is the sitting president who summons Mullen back into public life. She gives him an unusually broad mandate to investigate the attack and restore confidence in the government.
Mitchell must balance national security, public reassurance, civil liberties, retaliation and political survival. Bassett plays her as controlled and pragmatic: a president expected to project certainty even when she does not possess every answer.
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Carl Otieno is a Department of Justice lawyer and the commission’s lead investigator. He supplies legal and investigative expertise inside a team otherwise dominated by politicians, intelligence officials, billionaires and former presidential staff.
Carl’s role makes the commission’s work more concrete. He is concerned with evidence, procedure and the mechanics of establishing responsibility rather than merely winning a political argument.
Gaby Hoffmann as Monica Kidder
Monica Kidder is a Silicon Valley billionaire and technology executive. Her expertise and business empire become central to the investigation, making her a powerful possible resource as well as a possible obstruction.
Kidder connects the technological side of the cyberattack to the people and institutions with the money and influence to exploit it. Her ultimate connection to the conspiracy is explained below.
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Robert Lyndon is a Wall Street billionaire, corporate raider and political provocateur. He represents the financial influence networks operating around the formal government investigation.
Lyndon has mastered the use of money, public messaging and political relationships. He is therefore not just another wealthy suspect: he helps show how a conspiracy can operate through financial and media power as well as through official institutions.
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Mark Ivanir as Natan
Natan is an intelligence operative and a longtime confidant of Mullen. He represents an older intelligence culture built around personal trust and long-term relationships.
Netflix’s official description uses the broad term “intelligence operative.” Some secondary listings identify a more specific affiliation, but that detail should not be treated as established general biography without relying on the series’ own dialogue or credits.
Mozhan Navabi as Melissa Kornblau
Melissa Kornblau is the Zero Day Commission’s communications director and public-relations chief. Her work is essential because the investigation is also a battle over briefings, media narratives, public trust and political damage control.
Melissa is included in Netflix promotional material and in TV Guide’s cast listing, although Netflix’s main Tudum character guide does not give her a separate full profile. Her credit is documented through the Netflix Tudum hub and TV Guide.
Notable supporting and recurring cast
The following performers appear in named or identifiable supporting roles. Billing categories vary between Netflix, TV Guide and other databases, so these are best understood as notable supporting and additional credited characters rather than an official Netflix ranking.
| Actor | Character | Role in the series |
|---|---|---|
| Jay Klaitz | Tim Pennington | A commission employee and cyber-forensics specialist whose explanations help clarify how the malware spread. |
| Hannah Gross | Anna Sindler | A writer connected to Mullen’s memoir project; her disappearance becomes an early mystery. |
| Cuyle Carvin | Special Agent Tom McCarthy | The supervisor of Mullen’s Secret Service detail. |
| Eden Lee | Special Agent Angela Kim | An FBI figure associated with the National Cyber Investigative Joint Task Force. |
| Ryan Spahn | Blake “Leon” Felton | A member of the Reapers, the radical group initially blamed for the attack. |
| Colin Donnell | Erik Hayes | A supporting political or government figure in the wider investigation. |
| TJ Lee | Doris | A member of Mullen’s household or support staff. |
| Johnath Davis | White House Aide | A supporting White House role. |
| Mike McGowan | Field Operations Commander | A field-response role during the national crisis. |
| Alexis Cash | Allison | Mullen’s aide. |
| Jackson Eick | Nick Mullen | A credited Mullen-family role. |
| Ignacio Diaz-Silverio | Cesar Rocha | An additional credited character. |
| Nikita Bogolyubov | Alexi Lebedev | An additional credited character. |
| Jorge Luna | General Tom Myles | A supporting military or government figure. |
| Varak Baronian | Uri | An additional intelligence-related supporting role. |
| Charlotte Ewing | Lily Whitesell | A supporting family role connected to Valerie Whitesell. |
Names in this section are consolidated from TV Guide, Vague Visages and the series’ broader public cast information. Minor background credits may differ between databases and episode-level listings.
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How the Zero Day characters are connected
The Mullen family and inner circle
- George Mullen is the former president and head of the Zero Day Commission.
- Sheila Mullen is his wife, a former first lady, lawyer and judicial nominee.
- Alexandra Mullen is their congresswoman daughter.
- Valerie Whitesell is George’s former chief of staff and trusted political ally; the series later reveals a family connection as well.
- Roger Carlson is George’s former aide and fixer.
- The family’s grief over the death of a son from a drug overdose shapes George and Sheila’s decisions and helps explain George’s vulnerability during the investigation.
The White House and investigative apparatus
- President Evelyn Mitchell appoints George to lead the commission.
- Jeremy Lasch represents the CIA and the intelligence establishment.
- Carl Otieno is the commission’s lead investigator from the Department of Justice.
- Tim Pennington handles technical and forensic information.
- Angela Kim represents the FBI cyber-investigative apparatus.
- Tom McCarthy oversees Mullen’s protective detail.
- Melissa Kornblau manages the commission’s communications and public messaging.
Congress, media and political opposition
- Richard Dreyer is the Speaker of the House and a major political power broker.
- Evan Green is Mullen’s most visible media antagonist.
- Alex occupies both sides of the conflict: she is Mullen’s daughter and a congressional figure with reasons to scrutinize his commission.
The series intentionally blurs the boundaries between formal political opposition, television influence and conspiracy. A character may be trying to win a policy fight, control a narrative or protect a private interest at the same time.
Technology, finance and influence
- Monica Kidder represents Silicon Valley and the power of private technology.
- Robert Lyndon represents Wall Street, finance and political influence.
- Their importance grows as the investigation links the cyberattack to people who can combine technical capability, money and access to elected officials.
The Reapers and the initial explanation
The Reapers are the radical group initially blamed for the attack. Their presence gives the public and the authorities an apparent culprit, but Zero Day uses that early explanation to explore how quickly a frightening event can be assigned to a politically convenient enemy.
What the ending reveals (full spoilers)
Warning: The following section reveals the conspiracy, Alexandra Mullen’s role, the meaning of Proteus and George Mullen’s final decision.
Who is behind the attack?
The finale reveals that the conspiracy reaches into the U.S. political system. Richard Dreyer and Alexandra Mullen are involved, with support from Robert Lyndon and Monica Kidder, along with other elected officials and powerful participants.
The conspirators’ stated purpose is to use a shared national crisis to unite a divided country and overcome congressional paralysis. In other words, the attack is not presented as an isolated act of cybercrime. It is part of an effort to manufacture political unity through catastrophe, with technology, money and government authority working together.
Alexandra Mullen’s role
Alex is not merely an innocent daughter trapped between her father and the government. She participated in the conspiracy and knew about George’s cognitive problems. That knowledge makes the finale’s central moral choice intensely personal: George must decide whether to protect his daughter or tell the public what really happened.
Netflix’s ending coverage reports that Lizzy Caplan and Matthew Modine knew during casting that their characters were involved in the attack, even though the audience would not discover that until late in the series. That production detail is attributed to Netflix Tudum and creator Eric Newman rather than treated as a clue available to viewers from the start.
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Monica Kidder and Robert Lyndon
Kidder and Lyndon are not simply interchangeable billionaire villains. They connect two different sources of power to the political operation. Kidder’s technology is linked to the distribution of the malware, while Lyndon helps steer the public narrative and the broader political operation.
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Their roles make the conspiracy a network rather than a single mastermind’s plan: private technology supplies capability, financial influence supplies reach, and political actors supply access and an ideological justification.
What is Proteus?
Proteus is a fictional cyberweapon developed by the National Security Agency within the series. The show describes it as technology capable of causing a traumatic brain injury remotely and with precision. The malware involved in the attack is later distributed through technology associated with Monica Kidder.
Proteus should not be confused with a real NSA weapon or cited as evidence that such a system exists. It is a fictional plot device used to connect cyberwarfare, physical harm and George’s uncertain mental state.
Are Mullen’s hallucinations real?
Zero Day deliberately refuses to settle the cause of Mullen’s hallucinations. Proteus is presented as an intended possibility within the story, but the creative team also leaves room for grief, extreme stress and cognitive decline to explain what George experiences.
The finale therefore does not justify a definitive medical diagnosis. It is inaccurate to say that Proteus definitely caused his symptoms, just as it is too definite to say that every vision was solely the result of illness. The uncertainty is part of the show’s design and keeps the viewer inside George’s unstable point of view.
What happens to George?
George reads Alexandra’s confession and chooses to publicly name the conspiracy rather than deliver only the sanitized official version of events. The decision costs him politically and may damage his marriage and family relationships, but it preserves his commitment to telling the truth.
That ending completes the character’s central conflict. George was brought back because the public trusted him; he ultimately uses that trust against the political system and even against his own family when he concludes that concealing the truth would make him part of the conspiracy’s success.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Is Zero Day based on a true story?
No. Netflix describes Zero Day as a fictional story, although its premise draws on real concerns about cyberattacks, misinformation, political polarization and the vulnerability of modern infrastructure. The cybersecurity term “zero day” generally refers to a software vulnerability or attack that occurs before an effective patch or fix is available.
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Is Robert De Niro making his TV debut?
Not exactly. Zero Day is Robert De Niro’s first starring role in a television series, according to Netflix. Calling it his literal television debut is too broad, because he had appeared in television projects before this series. He is also credited as an executive producer on Zero Day.
How many episodes does Zero Day have?
There are six episodes, with runtimes ranging from 43 to 59 minutes. Netflix lists the runtimes as 49, 59, 50, 53, 43 and 53 minutes. The series is designated a limited series, so the six-episode story should not be described as an ongoing multi-season ensemble unless Netflix makes a later official announcement.
Viewing information
Zero Day premiered on February 20, 2025, and Netflix’s official title page lists all six episodes for streaming. The program is rated TV-MA and is in English. Because catalog access and metadata can vary by country, viewers should check their local Netflix listing for availability.
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The show was created by Eric Newman, Noah Oppenheim and Michael S. Schmidt, with Lesli Linka Glatter directing all six episodes. Netflix lists Robert De Niro, Jesse Plemons and Lizzy Caplan among the headline cast, while the broader character guide also highlights the political, intelligence, media, technology and family figures detailed above.
Why the cast structure matters
The most useful way to follow Zero Day is to separate its central character from the surrounding power blocs. George is the narrative center, while Alex, Roger, Valerie and Sheila form the emotional and political core around him. President Mitchell, Lasch, Carl, Pennington and Kim represent the official investigation. Dreyer, Green and Alex embody the political and media conflict. Kidder and Lyndon connect the story to private technology and finance.
This is also why a short “full cast” gallery can be misleading. Netflix’s title page promotes a headline group, Netflix Tudum provides the strongest character descriptions, and TV Guide and other databases list additional credited performers. The guide above labels the groups editorially as principal, supporting and additional rather than implying that Netflix has issued a definitive ranking for every role.
Frequently Asked Questions
Who plays the former president in Zero Day?
Robert De Niro plays George Mullen, the former U.S. president who is recruited to lead the Zero Day Commission after the cyberattack.
Who plays Alexandra Mullen in Zero Day?
Lizzy Caplan plays Alexandra “Alex” Mullen, George Mullen’s daughter and a New York congresswoman.
Who plays President Evelyn Mitchell?
Angela Bassett plays President Evelyn Mitchell, the sitting president who appoints George Mullen to lead the investigation.
Who plays the Speaker of the House?
Matthew Modine plays Richard Dreyer, the fictional Speaker of the House.
Who is the villain in Zero Day?
The series does not reduce the conspiracy to one villain. The finale reveals the involvement of Richard Dreyer and Alexandra Mullen, with support from Robert Lyndon, Monica Kidder and other powerful participants.
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Monica Kidder is involved in the conspiracy, and technology associated with her is connected to the malware’s distribution. The attack also involves political and financial figures, so she is part of a wider network rather than the only person responsible.
What is Proteus in Zero Day?
Proteus is a fictional NSA-developed cyberweapon that the series says can cause a traumatic brain injury remotely and precisely. It is not presented as a real-world NSA program.
Are Mullen’s hallucinations real?
The show deliberately leaves their cause unresolved. Proteus is one possible explanation, but grief, stress and cognitive decline are also left as possibilities. The series does not provide a definitive diagnosis.
Is Zero Day based on a true story?
No. It is a fictional Netflix thriller that draws on real concerns about cyberattacks, disinformation and political polarization.
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Netflix identifies the program as a limited series consisting of six episodes. The official listing supplied for this guide does not establish a continuing multi-season story, so renewal claims should not be treated as confirmed without a new announcement.
The Bottom Line
Zero Day is built around Robert De Niro’s George Mullen, but its cast works as a map of competing power centers: family, the White House, intelligence agencies, Congress, television, Silicon Valley and Wall Street. For a spoiler-free introduction, start with De Niro, Plemons, Caplan, Britton, Allen, Bassett, Modine and Stevens. After finishing the series, the key revelations are Alex and Dreyer’s involvement, Kidder and Lyndon’s support, the fictional Proteus weapon and George’s decision to expose the conspiracy despite the personal cost.
