Billy Crudup Dr. Philip Zimbardo Michael Angarano Christopher Archer Ezra Miller Daniel Culp / Prisoner 8612 Tye Sheridan Peter Mitchell / Prisoner 819 Olivia Thirlby Dr. Christina Maslach Nelsan Ellis Jesse Fletcher Moisés Arias Anthony Carroll Nicholas Braun Karl Vandy Gaius Charles Paul Vogel Keir Gilchrist John Lovett Ki Hong Lee Gavin Lee / Prisoner 3401 Thomas Mann Prisoner 416 Logan Miller Jerry Sherman / Prisoner 5486 Johnny Simmons Jeff Jansen / Prisoner 1037 James Wolk Mike Penny Matt Bennett Kyle Parker Brett Davern Hubbie Whitlow / Prisoner 7258 James Frecheville Matthew Townshend Miles Heizer Marshall Lovett Jack Kilmer Jim Randall / Prisoner 4325 Callan McAuliffe Henry Ward Benedict Samuel Jacob Harding Chris Sheffield Tom Thompson / Prisoner 2093 Harrison Thomas Andrew Ceros Albert Malafronte Father MacAllister Jim Klock Warren Kate Butler Mrs. Mitchell James C. Victor Mr. Mitchell Fred Ochs Professor Jim Cook