Cast of Legion

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

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

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

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

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

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

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

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

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

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

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

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