Liev Schreiber as Jonah Lynn

Jonah Lynn is a soldier-turned-homicide detective who retired shortly after serial killer Jurek Walter was sentenced. After tragedy struck his family, Jonah took a step back from the career and moved away from Fairhaven, but when Michael Frost (Landon Valentin) — one of the siblings presumably taken by Jurek — resurfaced three years later, Jonah returned to the case that broke him in hopes of finding Michael’s sister Felicia.

As noted in Decider’s Nocturne review, “Jonah, immune to Jurek’s deceptive ways, is tormented by grief, regret, and his complex history with the case. Despite his gruff voice and hardened exterior, Nocturne’s leading man wears his past on his sleeve, and a perpetually pained expression that suggests he’s seconds away from sobbing at any given moment.”

Jonah is played by Liev Schreiber, an Emmy Award nominee and Golden Globe nominee who also serves as an EP on the series. With more than 100 film and TV credits on IMDb, Schreiber has starred in Ray Donovan, Caught Stealing, The Perfect Couple, A Small Light, Across The River And Into The Trees, Asteroid City, Golda, Spotlight, The French Dispatch, Isle of Dogs, Spider-Man: Into the Spiderverse, Wes Craven’s Scream trilogy, The Manchurian Candidate, The Daytrippers, and many more. Plus, the New York Times called Schreiber “the finest American theater actor of his generation,” so his talents are known both on stage and on screen.

You can follow Graham on Instagram at @lievschreiber to learn more.

Zazie Beetz as Saga Bauer

Saga Bauer is an FBI Agent and Jonah’s goddaughter. The two are both personally invested in the Frost case and taking down Jurek, so in order to gain intel, Jonah reluctantly sends Saga undercover.

Saga is played by Zazie Beetz, who serves as an EP on the series with Schreiber. As noted in Decider’s Nocturne review, “Saga’s bold, badass undercover turn challenges Beetz to craft two characters, ride two wildly different emotional rollercoasters, and perform mental gymnastics to separate their intertwined stories and traumas. Beetz runs the gamut of emotions, showing fierce physicality and a thirst for revenge.”

If Beetz looks familiar, you may recognize her from nearly 50 film and TV credits on IMDb, including Atlanta, Joker, The Dutchman, Black Mirror, Bullet Train, Nine Days, The Harder They Fall, and more.

You can follow Graham on Instagram at @zaziebeetz to learn more.

Stephen Graham as Jurek Walter

Jurek Walter is the notorious serial killer at the center of Nocturne‘s crimes. Suspected of taking more than a half dozen lives and kidnapping two young siblings, Jurek was locked up for life in the Restricted Housing Unit at Riverside Psychiatric Hospital, but the spotlight turns on him again when Michael Frost, one of the siblings presumably taken by Jurek, resurfaces three years later.

Jurek is played by Emmy, Golden Globe, and Actor award-winner Stephen Graham. As noted in Decider’s Nocturne review, “Just over a year after Graham won three Emmy awards for writing, executive producing, and starring in Adolescence as the guilt-ridden father of a 13-year-old boy accused of murder, he reminds us of his remarkable range by making the haunting transformation into a sociopathic serial killer who subverts expectations. Despite Jurek’s brawny physique, he doesn’t rely on physical strength to subdue others. By pinpointing and preying upon personal weaknesses, the manipulative master of psychological warfare sneakily wraps people around his fingertips.”

With more than 140 TV and film credits on IMDb, you may also recognize Graham from performances in Boardwalk Empire, Boiling Point, The Peaky Blinders, A Thousand Blows, Heel, Accused, Line of Duty, Public Enemies, and more. Per Nocturne’s production notes, Graham was also “appointed Officer of the Order of the British Empire (OBE) in the 2023 New Years Honours List for his services to Drama.” A true legend.

You can follow Graham on Instagram at @stephengraham1973 to learn more.

Rory Culkin as Karl Anders

As noted in Decider’s Nocturne review, Karl Anders is caring nurse whose desire for a raise to help support his mother and younger brother on disability get him “promoted” to the basement, where Jurek swiftly assesses his needs and makes him feel like he matters.

Karl is played by Rory Culkin, who perfectly portrays a soft, tenderhearted soul at war with himself over his proclivity to see Jurek as more man than monster. In brief chats through a wired window and small door hatches, the two develop one of Nocturne’s most curious, compelling dynamics, with Graham and Culkin’s palpable chemistry fueling an unexpectedly intimate connection.

If Culkin looks familiar, that’s because he’s starred in more than 50 film and TV credits on IMDb, including roles in Under the Banner of Heaven, Waco, The Expecting, Castle Rock, City on a Hill, Halston, Black Mirror, Scream 4 and more. And yes, if you don’t know, he’s also the brother of actors Macaulay and Kieran Culkin.

Poorna Jagannathan as Agent Alexandra Quinn

Alexandra Quinn is a Special Agent for the FBI who’s called in to run the task force and lead the investigation into Felicia’s frost’s whereabouts. A mother in the midst of her own custody battle, Quinn’s credentials include a rare, refreshing warmth and parental passion that aids the investigation. And she nicely contrasts Jonah’s approach.

Quinn is played by Poorna Jagannathan who’s having one heck of a year in Deli Boys, Nobody Wants This, and Lanterns. You may also recognize the Nocturne star from Never Have I Ever, or roles in Wolves, Turtles All The Way Down, The Out-Laws, The Night Of, Big Little Lies, Ramy, and more.

You can follow Jagannathan on Instagram at @poornagraphy to learn more.

Bill Camp as Chief Dave Ellison

Shortly after Michael Frost is found we meet Fairhaven, Pennsylvania Police Chief Dave Ellison, who worked the original case with Jonah back in the day.

Chief Ellison is played by the legendary, award-nominated actor Bill Camp, who has nearly 100 film and TV credits on IMDb. Apple TV fans may recognize him from Presumed Innocent, but he’s also starred in Judgement Day, Sirens, The Gilded Age, The Mastermind, Huntington, The Queen’s Gambit, 12 Years a Slave, Vice, Killing of a Sacred Deer, Molly’s Game, and more.

Gary Carr as Nathan Pollack

Also taking part in the Frost/Jurek Walter investigation is Nathan Pollack, a police officer who previously worked with Jonah, Saga, and Ellison.

If Nathan looks familiar that’s because he’s played by Gary Carr, an actor, dancer, singer, and musician with two dozen film and TV credits on IMDb, including 21 Bridges, Death in Paradise, The Deuce, Bolden, Genius, The Peripheral, Trigonometry, Downton Abbey, and more. Per Nocturne’s production notes, “A graduate from LAMDA, Carr was snapped up by the Royal National Theatre to play the lead in the play Earthquakes in London,” so he’s known for his work on stage as well.

Chrissy Metz as Ida Frost

At the center of Nocturne is the mystery of Ida Frost’s two kidnapped children, Michael and Felicia Frost. When we first meet her in the hospital in Episode 1, it’s clear that she and Jonah have lots of history and complex emotions as a result of the initial investigation.

Ida is played by Emmy and Golden Globe nominee Chrissy Metz, who you may recognize from her role as Kate Pearson in This Is Us. With nearly two dozen TV and film credits, Metz has also starred in Breakthrough, American Horror Story, The Hunting Wives, and more. In addition to acting, Metz is also the author of her memoir, This Is Me, and a children’s book, When I Talk to God, I Talk About You. And as you may know from watching certain projects she’s also a singer.

You can follow Metz on Instagram at @chrissymetz to learn more.

Landon Valentin as Michael Frost

In Nocturne Episode 1, a young boy emerges from the woods and wanders onto a bridge where locals find him and call the police. That boy? Michael Frost, who went missing three years earlier with his sister Felicia. The two were presumed victims of Jurek Walter, so the race is on to learn how Michael was released while Jurek’s in custody, who was holding him, and where is sister is.

Michael Frost is played by Landon Valentin, a young actor from California who’s starred in several shorts including Summer Reighn, Stranger in the Woods, Treasure Imagination, and The Last Hurrah. He also appeared in 2024’s The Short Game prior to landing his role in Nocturne. Per Nocturne‘s production notes, “Landon fell in love with acting at a young age. He started taking classes at the age of seven and has been working on his skills ever since…
In his free time he enjoys riding his bike, snowboarding, playing soccer, and exploring the world.”

You can follow Valentin on Instagram at @itslandonvalentin to learn more.