Chris O'Neil ... Noah Wilder
Rhiannon Leigh Wryn ... Emma Wilder
Joely Richardson ... Jo Wilder
Timothy Hutton ... David Wilder
Rainn Wilson ... Larry White
Kathryn Hahn ... Naomi Schwartz
Michael Clarke Duncan ... Nathanial Broadman
Kirsten Alter ... Sheila Broadman (as Kirsten Williamson)
Irene Snow ... Teacher in Meadow
Marc Musso ... Harry
Nicole Munoz ... Kid with Braces
Scott E. Miller ... School Guard (as Scott Miller)
Megan McKinnon ... Wendy
Randi Lynne ... Julie the Babysitter
Tom Heaton ... Future Scientist
John Burnside ... Future Scientist's Co-Worker
Sam Polin ... Armed Cyborg (as Samuel Polin)
Phillip Brooks ... Armed Cyborg
Daniel Bacon ... Technician
Carlo Fanella ... Technician
Paul Jarrett ... Technician
Jerry Wasserman ... Utilities Commisioner
Camyar Chai ... Stu
Fred Keating ... Police Captain
Dagmar Midcap ... Newscaster
John Shaw ... Dr. Rose
Patrick Gilmore ... FBI Task Force Agent
Chad Cole ... FBI Task Force Agent
Kaaren de Zilva ... CPS Officer
David Joshi ... FBI Video Technician
Bruce Harwood ... Scientist
Kathleen Duborg ... Scientist
Hiro Kanagawa ... Scientist
Brian Greene ... Intel Scientist
Curtis Caravaggio ... Army Officer
Mackenzie Hamilton ... Teenage Cyborg
Calum Worthy ... Teenage Cyborg
Elias Calogeros ... Child in Meadow
Caleb Kemble ... Child in Meadow
Joanna Kosloff ... Child in Meadow (as Joanna Coons)
Grace Walker ... Child in Meadow
Evan Leeson ... Child in Meadow
Eliana MacFarlane ... Child in Meadow
Sophia Wik ... Child in Meadow
Amanda Wik ... Child in Meadow
Elora Penner ... Child in Meadow
Sawyer Nicholson ... Child in Meadow
Tamatea Westby ... Child in Meadow
Julia Arkos ... Kindergarten Teacher
Erica Jones ... Little Girl (voice) (uncredited)