They

Laura Regan

Julia Lund

Marc Blucas

Paul Loomis

Ethan Embry

Sam Burnside

Jon Abrahams

Billy Parks

Dagmara Dominczyk

Terry Alba

Desiree Zurowski

Mary Parks

Alexander Gould

Young Billy

Mark Hildreth

Troy

Jonathan Cherry

Darren

Jessica Amlee

Young Julia

Jay Brazeau

Dr. Booth

L. Harvey Gold

Professor Crowley

David Abbott

Professor Adkins

Jodelle Ferland

Sarah

Peter LaCroix

David Parks (as Peter Lacroix)

Colin Foo

Chinese Chef