The Step Brothers cast features Will Ferrell, John C. Reilly and Mary Steenburgen. This info article contains minor spoilers and character details for Adam McKay’s 2008 movie on Hulu. Check out more streaming guides in Vague Visages’ Know the Cast category.

Step Brothers explores the friendship between two middle-aged men. In California, Brennan struggles to accept his mother’s new romantic relationship. The narrative follows the main protagonist as he develops an unbreakable bond with his new step-sibling. Here’s every actor and character in Step Brothers.

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Step Brothers Cast: Will Ferrell as Brennan Huff

Character Profile: A 40-year-old California native. He feels protectives of his divorced mother. Brennan displays his vocal and creative skills while bonding with his new step-brother.

Ferrell’s Resume: Saturday Night Live Cast Member (1995-2022), Frank in Old School (2003), Ron Burgundy in Anchorman: The Legend of Ron Burgundy (2004), Lars Erickssong in Eurovision Song Contest: The Story of Fire Saga (2020), Present in Spirited (2022)

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Step Brothers Cast: John C. Reilly as Dale Doback

Character Profile: Brennan’s step-brother. He is the misogynistic son of a widower. Dale values his entrepreneurial skills while promoting his unique lifestyle.

Reilly’s Resume: Reed Rothchild in Boogie Nights (1997), Amos Hart in Chicago (2002), Dewey Cox in Walk Hard: The Dewey Cox Story (2007), Dale Doback in Step Brothers (2008), Jerry Buss in Winning Time (2022-23)

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Step Brothers Cast: Mary Steenburgen as Nancy Huff

Character Profile: Brennan’s mother. She is a widower who marries a doctor. Nancy worries about Brennan’s immature behavior ruining her marriage.

Steenburgen’s Resume: Amy Robbins in Time After Time (1979), Clara Clayton in Back to the Future Part III (1990), Diana Boyle in Last Vegas (2013), Gail Klosterman in The Last Man on Earth (2015-18), Felicia Kimball in Nightmare Alley (2021)

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Step Brothers Cast: Richard Jenkins as Dr. Robert Doback

Character Profile: Dale’s father. He is a doctor who attempts to be a disciplinarian. Robert clashes with Brennan and Dale while befriending Nancy’s youngest son.

Jenkins’ Resume: Walter in The Visitor (2007), Steven Frost in Berlin Station (2016-19), Giles in The Shape of Water (2017), Ezra Grindle in Nightmare Alley (2021), Erik Blake in The Humans (2021)

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Step Brothers Cast: Adam Scott as Derek

Character Profile: Nancy’s youngest son. He is a helicopter leasing agent who boasts about his income and celebrity connections. Derek teases Brennan while clashing with Dale.

Scott’s Resume: Ben Wyatt in Parks and Recreation (2010-15), Jason Fryman in Friends with Kids (2011), Ted Hendricks in The Secret Life of Walter Mitty (2013), Ed Mackenzie in Big Little Lies (2017-19), Mark Scout in Severance (2022-)

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Step Brothers Cast: Kathryn Hahn as Alice

Character Profile: Derek’s wife. She is a timid woman who dreams of a happier life. Alice pursues a sexual relationship with Dale.

Hahn’s Resume: Lily Lebowski in Crossing Jordan (2001-08), Edie Fitzgerald in We’re the Millers (2013), Raquel Fein in Transparent (2014-19), Eve Fletcher in Mrs. Fletcher (2019), Agatha Harkness in WandaVision (2021)

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The Step Brothers cast also includes:

• Andrea Savage as Denise
• Lurie Poston as Tommy
• Elizabeth Yozamp as Tiffany
• Logan Manus as Chris Gardoki
• Travis Flory as Redheaded Kid
• Lili Rose McKay as 7-Year-Old Girl
• Shira Piven as Nurse
• Seth Morris as Doctor
• Wayne Federman as Blind Man
• Maria Quiban as TV Anchor

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