Kyle Catlett as T.S. Spivet

Helena Bonham Carter as Dr. Clair

Judy Davis as G.H. Jibsen

Callum Keith Rennie as Father

Niamh Wilson as Gracie

Jakob Davies as Layton

Rick Mercer as Roy

Robert Maillet as Giant Hobo

Dominique Pinon as Two Clouds

Julian Richings as Ricky

Richard Jutras as Lecturer

Mairtin O'Carrigan as Lecturer

Michel Perron as The vigilant

Dawn Ford as Marge

Harry Strandjofski as Policeman

Susan Glover as Cathy

James Bradford as Smithsonian President

Lisa Bronwyn Moore as Judy

Felicia Shulman as Jibsen's Secretary

Dylan Kingwell as Little Boy

Eric Davis as Towncar Driver

Rebecca Amzallag as Reception Waitress

Amber Goldfarb as Reception Waitress

Leigh Ann Taylor as Smithsonian's Receptionist

Andrew Simms as Reception Guest

Una Kay as Reception Guest

Sylvia Stewart as Reception Guest

Sabrina Reeves as Reception Guest

Ana Alarcon as Lady at train station

Zachary Amzallag as Waiter

Kyle Allatt as Photographer

Martin Brisebois as Perpetual motion machine presenter

Victor Cornfoot as Airport Officer

Christie Claymore as Smithsonian Scientist's Date

Anne-Sophie Bozon as Figuration

Kyle Gatehouse as Student Butte Museum