Main •
Jonathan Groff as Holden Ford, a
special agent in the FBI's Behavioral Science Unit (BSU) •
Holt McCallany as Bill Tench, a special agent in the FBI's BSU •
Anna Torv as Wendy Carr, a psychology professor working towards tenure at
Boston University who joins the BSU. She is a
closeted lesbian. •
Hannah Gross as Debbie Mitford (season 1), Ford's girlfriend and a graduate student in sociology at the
University of Virginia •
Cotter Smith as Robert Shepard (season 1; guest season 2), the assistant director at the FBI Academy overseeing the BSU •
Stacey Roca as Nancy Tench (season 2; recurring season 1), Bill's wife • Joe Tuttle as Gregg Smith (season 2; recurring season 1), a special agent newly assigned to the BSU •
Michael Cerveris as Ted Gunn (season 2), Shepard's successor as overseer of the BSU •
Lauren Glazier as Kay Manz (season 2), a bartender and Carr's love interest •
Albert Jones as Jim Barney (season 2; guest season 1), an Atlanta FBI agent •
Sierra McClain as Tanya Clifton (season 2), a hotel worker who brings Holden's attention to the
Atlanta child murders •
June Carryl as Camille Bell (season 2), a grieving mother of Yusef Bell, one of the Atlanta murder victims and the organizer of the Committee to Stop Children's Murders
Recurring •
Cameron Britton as
Ed Kemper, a serial killer interviewed by Ford and Tench • Alex Morf as Mark Ocasek, a police officer from
Altoona, Pennsylvania •
Joseph Cross as Benjamin Barnwright, a murder suspect in Altoona •
Marc Kudisch as Roger Wade, a
Fredericksburg elementary-school principal •
Michael Park as Peter Dean, an
Office of Professional Responsibility (OPR) investigator • George R. Sheffey as John Boylen, an OPR investigator • Duke Lafoon as Gordon Chambers, an
Adairsville detective •
Peter Murnik as Roy Carver, a
Sacramento detective •
Happy Anderson as
Jerry Brudos, a serial killer interviewed by Ford and Tench • Sonny Valicenti as
ADT serviceman /
Dennis Rader (BTK) • Zachary Scott Ross as Brian Tench, Bill and Nancy's adopted son •
Nate Corddry as Art Spencer (season 2), a detective investigating a murder near the Tench household • Regi Davis as
Maynard Jackson (season 2), mayor of Atlanta •
Gareth Williams as Redding (season 2), the chief of Atlanta police • Drew Seltzer as Dale Harmon (season 2), Bill and Nancy's neighbor •
Dohn Norwood as
Lee Brown (season 2), the Atlanta police commissioner •
Brent Sexton as Garland Periwinkle (season 2), a retired agent who assists the Georgia Bureau of Investigation • Christopher Livingston as
Wayne Williams (season 2)
Guests •
Lena Olin as Annaliese Stilman (season 1), Carr's former lover and head of the psychology department at Boston University •
Sam Strike as
Montie Rissell (season 1), a serial killer interviewed by Ford and Tench • Jack Erdie as
Richard Speck (season 1), a mass murderer interviewed by Ford and Tench •
Oliver Cooper as
David Berkowitz (season 2), the serial killer known as "Son of Sam" •
Robert Aramayo as
Elmer Wayne Henley Jr. (season 2) • Michael Filipowich as
William "Junior" Pierce (season 2) • Corey Allen as
William Henry Hance (season 2) •
Damon Herriman as
Charles Manson (season 2); Herriman previously portrayed Manson in the 2019 film
Once Upon a Time in Hollywood. •
Christopher Backus as
Tex Watson (season 2) •
Morgan Kelly as
Paul Bateson (season 2) ==Development and production==