The Long Bright River cast features Amanda Seyfried as Mickey, Nicholas Pinnock as Truman and Ashleigh Cummings as Kacey. This info article contains minor spoilers and character details for Nikki Toscano and Liz Moore’s 2025 Peacock miniseries. Check out more cast guides in Vague Visages’ Know the Cast category.

Long Bright River takes place in Philadelphia. When several sex workers get murdered, a female patrol officer named Mickey worries about her estranged sister. The narrative follows the main protagonist as she investigates a criminal conspiracy while protecting a family secret. Here’s every actor and character in Long Bright River, an adaptation of Liz Moore’s 2020 novel.

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Long Bright River Cast: Amanda Seyfried as Mickey

Character Profile: A Philadelphia police officer. She attended a local Ivy League school while pursuing a music career as a clarinet player. Mickey develops romantic feelings for a former partner while hiding the truth about her “son.”

Seyfried’s Resume: Karen Smith in Mean Girls (2004), Sophie in Mamma Mia! (2008), Cosette in Les Misérables (2012), Marion Davies in Mank (2020), Elizabeth Holmes in The Dropout (2022)

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Long Bright River Cast: Nicholas Pinnock as Truman Dawes

Character Profile: Mickey’s former partner. He assists with a serial killer investigation. Truman develops a romantic relationship with Mickey but gets angry when he is identified as a suspect.

Pinnock’s Resume: Nick in Emu’s Wide World (1987-88), SHIELD Tech in Captain America: The First Avenger (2011), Frank Sutter in Fortitude (2015), Aaron Wallace in For Life (2020-21), Jesus in The Book of Clarence (2023)

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Long Bright River Cast: Ashleigh Cummings as Kacey

Character Profile: Mickey’s sister. She is a recovering drug addict who disappears during a serial killer investigation. Kacey re-emerges and confronts Mickey about the past.

Cummings’ Resume: Debbie Vickers in Puberty Blues (2012-14), Vicki Maloney in Hounds of Love (2016), Vic McQueen in NOS4A2 (2019-20), Adult Pippa in The Goldfinch (2019), Abby Conroy in Citadel (2023)

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Long Bright River Cast: John Doman as Gee

Character Profile: Mickey’s grandfather. He is a bartender who protects his family. Gee looks after the best interests of Mickey and his great-grandson.

Roman’s Resume: Acting Commissioner William A. Rawls in The Wire (2002-08), Rodrigo Borgia in Borgia (2011-14), Bruce Butler in The Affair (2014-19), Carmine Falcone in Gotham (2014-17), John Mitchell in The Trial of the Chicago 7 (2020)

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The Long Bright River cast also includes:

• Callum Vinson as Thomas Fitzpatrick
• Dash Mihok as Eddie Lafferty
• Patch Darragh as Sergeant Ahearn
• Britne Oldford as Dr. Aura Williams
• Joe Daru as Detective Danjarat
• Rivera Reese as Nicole
• Matthew Del Negro as Simone Cleare
• Perry Mattfeld as Paula
• Eden Marryshow as Alonzo
• Harriet Sansom Harris as Mrs. Mahon
• OT The Real as Dock McClatchie
• Don Sparks as Twohey
• John Scurti as McGivney
• Hannah D. Scott as Jeannie
• Vaughan Reilly as Teen Kacey
• Maura Day as Teen Mickey
• Cate Elefante as Young Mickey
• Evelyn Davis as Young Kacey

Q.V. Hough (@QVHough) is Vague Visages’ founding editor.