How to Watch Prime Target Online in 4K

If you want to watch Prime Target, the Apple TV+ conspiracy thriller series starring Leo Woodall and Quintessa Swindell, this complete guide covers everything you need — what the show is, who created it, what it is about, where to stream it, and how to watch in full 4K quality with InfinityTV.

What is Prime Target?

Prime Target is an American conspiracy thriller series created by Steve Thompson, premiering on Apple TV+ on January 22, 2025. The eight-episode series stars Leo Woodall as a Cambridge University mathematics PhD candidate who discovers that his research into prime numbers may hold the key to breaking every digital encryption on the planet — and that someone wants him dead for it.

Prime Target is Thompson's first major original television creation for a US streaming service. The series attracted strong critical and viewer interest on Apple TV+ and stars one of the most prominent emerging actors in British television alongside a cast that includes Quintessa Swindell, Martha Plimpton, Sidse Babett Knudsen, David Morrissey, and Stephen Rea.

Who created Prime Target?

Steve Thompson is the creator and writer of Prime Target. Thompson is a British television writer known for his work on Sherlock (BBC) — for which he wrote several episodes including "The Blind Banker" — and Jericho (ITV). Prime Target represents his first original series created for an American streaming platform, and marks an expansion of his thriller writing into the contemporary tech-and-espionage territory.

The series combines two established thriller traditions: the mathematical genius whose discovery makes them dangerous (in the tradition of A Beautiful Mind and The Da Vinci Code) and the espionage thriller in which ordinary individuals are suddenly enmeshed in state-level games of power and surveillance.

Who stars in Prime Target?

• Leo Woodall as Edward Brooks — the Cambridge mathematics PhD candidate at the centre of the story. Woodall is the British actor best known for The White Lotus Season 2 (2022), in which his performance made him one of the most talked-about new faces in prestige television. Prime Target is his first leading role in a major television series.
• Quintessa Swindell as Taylah Sanders — an NSA agent who has been monitoring mathematicians globally and takes it upon herself to keep Edward safe. Swindell is known for Black Adam (2022).
• Martha Plimpton — the Emmy and Tony Award-nominated actress in a supporting role
• Sidse Babett Knudsen — the Danish actress known for Borgen (the Danish political drama) and Westworld
• David Morrissey — the British actor known for The Walking Dead, The Driver, and State of Play
• Stephen Rea — the Academy Award-nominated Irish actor (The Crying Game)
• Harry Lloyd, Fra Fee, Ali Suliman, Jason Flemyng, Joseph Mydell

What is Prime Target about?

Prime Target follows Edward Brooks (Leo Woodall), a Cambridge University mathematics PhD candidate who is on the verge of a breakthrough: a method to identify prime numbers that, if completed, would allow him — or anyone who had it — to break every single digital encryption system in the world. Every bank account, every government database, every private communication secured by RSA encryption would be vulnerable.

When Edward realises how close he is to cracking the problem, he attracts the attention of parties he cannot identify and does not understand. Taylah Sanders (Quintessa Swindell), an NSA agent who has quietly been monitoring exceptional mathematicians around the world for exactly this scenario, inserts herself into his life to protect him.

The eight episodes unfold as a chase thriller: Edward's mathematical work draws him into a conspiracy involving government agencies, private actors, and interests that extend from Cambridge to Baghdad. The first episode opens on the streets of Baghdad, Iraq, and the series maintains an international scope throughout.

Prime Target uses prime numbers — real mathematical objects with genuine cryptographic implications — as its thriller MacGuffin. The series worked with a real mathematics advisor from Northeastern University to ensure that the mathematical concepts are accurately represented, lending the thriller's technological premise an unusual degree of authenticity.

The real mathematics behind Prime Target

The series' thriller premise rests on a real mathematical foundation. RSA encryption — the cryptographic system that secures the majority of digital communications, financial transactions, and government data on the internet — depends on the mathematical difficulty of factoring large numbers into their prime components. If someone could find a systematic way to identify prime numbers efficiently (the so-called "prime finder" that Edward Brooks is developing), RSA encryption would effectively be broken.

This is not entirely a fictional scenario: the development of quantum computing, which could theoretically execute certain prime factorization algorithms at speed, is one of the reasons cryptographers and governments are actively developing post-quantum cryptography — new encryption systems that would remain secure even if prime factorization became computationally tractable. Prime Target takes this real concern and dramatizes it as a thriller about what happens when a single mathematician gets close to something that powerful institutions cannot allow to become public.

The show consulted a Northeastern University mathematics advisor to keep this premise grounded.

How to watch Prime Target in 4K — step by step

1. Open Apple TV+. Prime Target is an Apple TV+ Original, available exclusively on Apple TV+ wherever the platform operates.
2. Confirm your Apple TV+ subscription. Apple TV+ is a flat-rate subscription giving access to all originals. Confirm your account is active.
3. Check your internet connection. 4K streaming requires a stable speed of at least 25 Mbps. Test your speed before you start.
4. Select a 4K-capable device. Apple TV 4K offers the best picture quality for Apple TV+ content. 4K Smart TVs with the Apple TV+ app, Roku 4K, and Amazon Fire TV Stick 4K also support Apple TV+ in 4K.
5. Enable Dolby Vision. Apple TV+ content is mastered in Dolby Vision on compatible devices. Enable it in your television's picture settings for maximum visual quality.
6. Use InfinityTV. InfinityTV brings your Apple TV+ content together with InfinityTV's own library of 150,000+ Movies & Series and 22,000+ live TV channels from around the world — one app, everything in one place.
7. Watch episodes in sequence. The first two episodes of Prime Target were released simultaneously on January 22, 2025, followed by one episode per week through March 5. The narrative builds continuously; start from the beginning.

Why watch Prime Target?

Leo Woodall makes Prime Target worth watching on his performance alone. His White Lotus Season 2 appearance made him one of the most discussed new actors in prestige television, but that role was a supporting one. Prime Target gives him a leading role that requires him to carry eight episodes of thriller across multiple registers — intellectual intensity, physical danger, and the specific disorientation of an ordinary person discovering that their work has placed them in extraordinary peril.

The supporting cast — David Morrissey, Stephen Rea, Sidse Babett Knudsen, Martha Plimpton — is the kind of ensemble that signals serious production investment. Apple TV+ has shown, with Severance, Dope Thief, and Pluribus, that it is willing to back serious original drama; Prime Target fits that pattern.

The series also engages with genuinely contemporary anxieties: digital surveillance, the vulnerability of encryption infrastructure, the power of states and private actors to monitor individuals, and the specific danger that comes with knowing something that powerful institutions want to keep unknown.

What to watch after Prime Target

If you enjoy the tech-conspiracy thriller of Prime Target:

• Severance (Apple TV+) — Apple TV+'s other major conspiracy thriller. Two seasons, deeply original.
• Mr. Robot (Amazon Prime Video) — four seasons of the best hacker drama in television history, anchored by Rami Malek's lead performance.
• Homeland (Paramount+) — eight seasons of espionage drama. The first two seasons are the gold standard of the format.

For more of what is worth watching, see our guide to top series to watch in 2025 and the New Yorker's best TV shows of the year. Prime Target is listed on IMDb with cast and critical reception.

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Frequently asked questions

Where can I watch Prime Target? Prime Target is available exclusively on Apple TV+. You can also access it through InfinityTV, which brings Apple TV+ content alongside 22,000+ live channels and 150,000+ Movies & Series in one app.

Who stars in Prime Target? Prime Target stars Leo Woodall as Cambridge mathematician Edward Brooks and Quintessa Swindell as NSA agent Taylah Sanders. Supporting cast includes Martha Plimpton, Sidse Babett Knudsen, David Morrissey, Stephen Rea, and Harry Lloyd.

What is the mathematical premise of Prime Target? The series centres on a mathematician close to discovering a method that could break RSA encryption — the system that secures digital communications globally. This is a real concern in cryptography: RSA encryption depends on the difficulty of prime number factorization.

How many episodes is Prime Target? Prime Target consists of eight episodes, premiered January 22, 2025 (first two episodes), with new episodes weekly through March 5, 2025.

Who created Prime Target? Prime Target was created by Steve Thompson, a British television writer known for his work on Sherlock (BBC). The series is his first original creation for a US streaming platform.

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