Maniac

Emma Stone

Annie Landsberg

Jonah Hill

Owen Milgrim

Sonoya Mizuno

Dr. Azumi Fujita

Ramya Pratt

Vicky / Green Hoodie Woman

Maho Honda

Intake Tech

Justin Theroux

Dr. James K. Mantleray

Sally Field

Dr. Greta Mantleray

Jacqueline Grabois

Annie's Roommate

Aaralyn Anderson

Belle Milgrim / Australia

Eric T. Miller

Daddy's Here Operator / Douglas on the Radio

Marlene Ginader

Beth Sanders

Zach Shearon

Young Soldier / Young Boy in a Truck

Leo Fitzpatrick

Lance

Jojo Gonzalez

Agent Lopez

Maxine Prescott

Mrs. Finkelstein

Hank Azaria

Hank Landsberg (voice)

Trudie Styler

Angelica Milgrim

Ariel Kavoussi

Female Ad Buddy / Bianca Forsythe / Dragonfly (voice)