Atrabilious

Leon Addison Brown

as Steven Joyner

Mark Boone Junior

as Dr. Eduard Gillespie

Evan Jonigkeit

as Dr. Raphael Clearwater

Jeffrey Wright

as Vincent Daugherty

Whoopi Goldberg

as Dr. Andrea Hart

Brooks Ashmanskas

as Todd Jenkins

Lewis Black

as Roy Altman

Joel de la Fuente

as Mark Nava

Hunter Parrish

as Milo Kramer

Alec Baldwin

as Proctor Carlisle

William Atticus Parker

as Anton Kantoliev

Steven Maier

as Bradley Atkinson

David Pittu

as Domonick Calderon

Andy Karl

as Greg Meyers

Ward Horton

as Miles Zimmerman

Michelangelo Milano

as Frank Webster

Jaden Michael

as Gregori Kantoliev

Sabina Friedman-Seitz

as Kate Sullivan

Dan Finnerty

as Levi Walker

Will Hochman

as Charles

Adam Piacente

as Alan Kantoliev