Tom Hiddleston

(Charles 'Chuck' Krantz)

Jacob Tremblay

(Charles 'Chuck' Krantz (teen))

Benjamin Pajak

(Charles 'Chuck' Krantz (pre-teen))

Nick Offerman

(Narrator (voice))

Chiwetel Ejiofor

(Marty Anderson)

Karen Gillan

(Felicia Gordon)

Annalise Basso

(Janice Halliday)

Mia Sara

(Sarah Krantz)

Mark Hamill

(Albie Krantz)

Samantha Sloyan

(Miss Rohrbacher)

Trinity Bliss

(Cat McCoy)

David Dastmalchian

(Josh)

Matthew Lillard

(Gus)

Kate Siegel

(Miss Richards)

Rahul Kohli

(Bri)

Harvey Guillén

(Hector)

Saidah Arrika Ekulona

(Andrea)

Carl Lumbly

(Sam Yarbrough)

Michael Trucco

(Dylan's Dad)

Q'orianka Kilcher

(Virginia 'Ginny' Krantz)

Violet McGraw

(Iris)

Andrew Grush

(Mac)

Heather Langenkamp

(Vera Stanley)

Franklin Ritch

(Brent)

Antonio Raul Garcia

(Brian Krantz)

Molly C. Quinn

(Chuck's Mother)

Sauriyan Sapkota

(Ram)

Mike Flanagan

(Mourner)

Matt Biedel

(Doctor Winston)

Carla Gugino

(News and Commercial Voice (voice))

Elan Gale

(Radio News Reporter (voice))

Scott Wampler

(Radio Host #2 (voice))

Hamish Linklater

(American Reporter (voice))

Axelle Carolyn

(French Reporter (voice))

Sandra Hess

(German Reporter (voice))

Lauren LaVera

(Italian Reporter (voice))

Trevor Macy

(Mourner (uncredited))