Peter Sarsgaard as Stanley Milgram

Winona Ryder as Alexandra "Sasha" Milgram

Jim Gaffigan as James McDonough

Edoardo Ballerini as Paul Hollander

John Palladino as John Williams

Kellan Lutz as William Shatner

Dennis Haysbert as Ossie Davis

Danny A. Abeckaser as Braverman

Taryn Manning as Mrs. Lowe

Anthony Edwards as Miller

Lori Singer as Florence Asch

Josh Hamilton as Tom Shannon

Anton Yelchin as Rensaleer

Adriana Randall as Mrs. Stein

Donnie Keshawarz as Bruno

Michael Siberry as George Bellak

Ned Eisenberg as Solomon Asch

John Leguizamo as Taylor

Harley Ware as Alan Elms

Jason Black as Sasha's Suitor

Kyla Noelle as Party Hostess

Minnie as Elephant in the Room

Tom Farrell as Whittaker

Xavier Fan as Taketo Murata

Craig De Lorenzo as Student #1

Emily Vere Nicoll as Donna Abbott

Gary Shteyngart as Worthheimer

Abe Altman as Curtis

Paul Lazar as Paul Errara

Gameela Wright as Mrs. Greer

Pascal Yen-Pfister as Serge Moscovici

Mark Elliot Wilson as Mr. Abe Lincoln

Lucy Fava as Michele Milgram

Jude Patrick White as Marc Milgram

Emerson Rosenthal as Maury Silver

Betty Gabriel as Sally

Tom Bateman as Dick Cavett

Diego Cortez as Percy

Emily Tremaine as Shelia Jarcho

Vondie Curtis-Hall as Thomas Shine

Harold Takooshian as Familiar Stranger

Jicky Schnee as Woman in Yellow

Karl Geary as Stephen Macht

Tom Roma as Counterman

Emily Nicole Hansen as Hospital Receptionist

Bay Bryan as Harvard Student

Derek Chadwick as Harvard Student

Adrian Centoni as Harvard Student

Anthony Gallino as Harvard Student

Cecelia Gray as Harvard Student

Nina Hausner as Harvard Student

Clara Lipfert as Harvard Student

Natalia Miranda Guzman as Harvard Student

Benjamin Russell as Harvard Student

Jon Steiger as Harvard Student

Justin Cass as C.U.N.Y. Student

Dean David as C.U.N.Y. Student

Aaron Dalla Villa as C.U.N.Y. Student

Robyn Michele Frank as C.U.N.Y. Student

Sakura Lin as C.U.N.Y. Student

Michelle Martinez as C.U.N.Y. Student

Martin Mundzik as C.U.N.Y. Student

Chris Nester as C.U.N.Y. Student

John Pinerio as C.U.N.Y. Student

Thomas Ahlers as Small World Problem Experimenter

Kerry Johnson as Small World Problem Experimenter

Spencer Kennedy as Small World Problem Experimenter

Sam Lipstyle as Small World Problem Experimenter

Joel Milgram as Small World Problem Experimenter

Alex Provan as Small World Problem Experimenter

Anna Thorngate as Small World Problem Experimenter

Dustin Yellin as Small World Problem Experimenter

Michally Kaiyalethe Diamond as Contemporary Crowd Crystal Experimenter

Piibe Kolka as Contemporary Crowd Crystal Experimenter

Robert McDonough as Contemporary Crowd Crystal Experimenter

Alexandra Milgram as Contemporary Crowd Crystal Experimenter

Lucas K. Schlenk as Contemporary Crowd Crystal Experimenter

Mamoudou Athie as Crying Man (uncredited)