Legion (TV) Cast
The cast of Legion. Updated on October 3, 2025.
69 actors
Dan Stevens
as David Haller / Legion (27 episodes)

Dan Stevens stars as David Haller, a mutant diagnosed with schizophrenia who struggles to control his immense powers.

Rachel Keller
as Sydney ‘Syd’ Barrett (27 episodes)

Rachel Keller plays Sydney 'Syd' Barrett, a mutant with the ability to swap bodies with anyone she touches.

Aubrey Plaza
as Lenny Busker (27 episodes)

Aubrey Plaza takes on the role of Lenny Busker, a friend of David Haller who undergoes a series of bizarre transformations.

Jeremie Harris
as Ptonomy Wallace (27 episodes)

Jeremie Harris portrays Ptonomy Wallace, a mutant with the ability to remember everything and explore people's memories.

Amber Midthunder
as Kerry Loudermilk (27 episodes)

Amber Midthunder plays Kerry Loudermilk, a mutant who shares a body with her twin, Cary.

Bill Irwin
as Cary Loudermilk (27 episodes)

Bill Irwin appears as Cary Loudermilk, a scientist and mutant who shares his body with his twin, Kerry.

Jean Smart
as Melanie Bird (20 episodes)

Jean Smart is Melanie Bird, a therapist and leader of a group of mutants helping David.

Mackenzie Gray
as The Eye (8 episodes)

Mackenzie Gray plays The Eye, an antagonist and powerful mutant who can switch his vision between people.

Katie Aselton
as Amy Haller (9 episodes)

Katie Aselton is Amy Haller, David's adoptive sister who is deeply concerned for his well-being.

Hamish Linklater
as Clark Debussy (22 episodes)

Hamish Linklater portrays Clark Debussy, an interrogator from Division 3 who becomes involved with David's story.

Lauren Tsai
as Jia-Yi / Switch (8 episodes)

Lauren Tsai plays Jia-Yi / Switch, a mutant with the ability to travel through time.

Navid Negahban
as Amahl Farouk / Shadow King (19 episodes)

Navid Negahban is Amahl Farouk / Shadow King, a powerful and malevolent mutant who has a history with David.

Luke Roessler
as David Haller (6-8 Years) (11 episodes)
Ellie Araiza
as Philly (5 episodes)
Lillian Lim
as The Monk (2 episodes)
Jason Mantzoukas
as Jerome / Wolf (1 episode)
Stephanie Corneliussen
as Gabrielle (4 episodes)
Harry Lloyd
as Charles Xavier / Professor X (3 episodes)
Sophie Mackenzie Nack
as Sweetie (1 episode)
Margaux Brooke
as Eloise (1 episode)
Matt Hamilton
as Ben (1 episode)
Mike Azevedo
as 'Renal Failure' Alvarez (1 episode)
Ese Atawo
as Day Room Duty Nurse (1 episode)
June B. Wilde
as Science Teacher (1 episode)
Maddie Phillips
as Jr. Prom Date (Crying) (1 episode)
Stephanie Lavigne
as Patient Dancer #7 (1 episode)
Camille Mitchell
as Dr. Bates (1 episode)
Eddie Jemison
as The Greek (2 episodes)
Daniel Kailin
as Asian Teenager (2 episodes)
Scott Lawrence
as Dr. Poole (3 episodes)
Kirby Morrow
as Benny (2 episodes)
Jillian Dion
as Irma Whitecloud (1 episode)
David Selby
as Brubaker (3 episodes)
David Ferry
as Dr. Kissinger (3 episodes)
Emily Shuttleworth
as Angry Boy (1 episode)
Gabriel Jacob-Cross
as Ptonomy (5 yrs) (1 episode)
Paul Belsito
as The Man Who Hides (1 episode)
Stephanie Van Dyck
as Skeletal Fat Lady (2 episodes)
Sharlene Royer
as Ptonomy's Mom (1 episode)
Jemaine Clement
as Oliver Bird (4 episodes)
Keir O'Donnell
as Daniel (2 episodes)
Brad Mann
as Rudy (4 episodes)
Quinton Boisclair
as Devil with the Yellow Eyes (8 episodes)
Sebastian Billingsley-Rodriguez
as David (Toddler) (2 episodes)
Tatyana Forrest
as David's Mother (3 episodes)
Dario Giordani
as David's Father (3 episodes)
Jesse Chongo
as Buster Debusey (1 episode)
Paul Jarrett
as General Stanley (1 episode)
Jennifer Kitchen
as Burt Hart (1 episode)
Ben Dextraze
as Aide (1 episode)
Devyn Dalton
as Angry Boy (5 episodes)
Christopher Collins
as Wall Street Frat Boy (1 episode)
Nathan Blair
as 10 Year Old Boy (1 episode)
Christian Convery
as David (4 Years Old) (3 episodes)
Molly Hagan
as Laura Mercer (1 episode)
Seamus Dever
as Don Eichman (1 episode)
Valentina Izumi
as David's wife (1 episode)
Lily Rabe
as Joan Barrett (1 episode)
Pearl Amanda Dickson
as Teen Syd (1 episode)
Violet Hicks
as Young Syd (1 episode)
Audrey Lynn
as 6 Year Old Syd (1 episode)
Nathan Hurd
as The Monk (4 episodes)
Carmela Nozza Guizzo
as Young Amy (4 yrs) (1 episode)
Lola Raie
as Singing Girl #3 (1 episode)
Lexa Gluck
as Vermillion #3 (8 episodes)
Samantha Desman
as 9-Year-Old Lenny (1 episode)
Curtis Webster
as Doctor (1 episode)
Spencer Ward
as Jason (1 episode)
Scarlett DeMeo
as Manson Girl #1 (2 episodes)
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