EnglishJohn Lithgow as Dr John Mathewson
Richard Council as Government (University Lab)
Robert Schenkkan as Government Aide (University Lab)
Paul Austin as General (University Lab)
Adrian Sparks as Scientist (University Lab)
Curt Dempster as Scientist (University Lab)
Bran Ferren as Lab Assistant (University Lab)
Christopher Collet as Paul Stephens (Ithaca)
Jill Eikenberry as Elizabeth Stephens (Ithaca)
Cynthia Nixon as Jenny Anderman (Ithaca)
Gregg Edelman as Science Teacher (Ithaca)
Abraham Unger as Roland
Robert Sean Leonard as Max (Ithaca)
David Quinn as Tennis (Ithaca)
Geoffrey Nauffts as Craig (Ithaca)
Katherine Hiler as Emma (Ithaca)
Trey Cummins as Terry (Ithaca)
Steve Borton as Local FBI Agent Ithaca
Harlan Cary Poe as Local FBI Agent (Ithaca)
Ned Schmidtke as Jenny' Father (Ithaca)
Sarah Burke as Jenny's Mother (Ithaca)
Allen DeCheser as Barnaby Jenny's Brother (Ithaca)
Arthur De Cheser as Barnaby Jenny's Brother (Ithaca)
John Mahoney as Lt Colonel Conroy (Science Fair)
Fred G Smith as Conroy's Lieutenant (Science Fair)
JD Cullum as Eccles (Science Fair)
Manny Jacobs as Moore (Science Fair)
Charles Fields as Price (Science Fair)
Eric Hsiao as Salto (Science Fair)
Trevor Bolling as Halley's Comet Kid (Science Fair)
Steven Jay Blum as Laser Efficiency Kid (Science Fair)
Heather Rose Dominic as Flirting Kids (Science Fair)
Bruce Smolanoff as Flirting Kids (Science Fair)
Joan Kendall as Registrar (Science Fair)
John Doumanian as Cabbie (Science Fair)
Tom Tarpey as Injection Doctor (Science Fair)
Alec Massey as FBI (Science Fair)
Edward D Murphy as FBI (Science Fair)
Dee Ann McDavid as FBI (Science Fair)
Joan Harris as Barbara Collins (Science Fair)
Kerry Donovan as Himself - WBNG News (Science Fair)
Ken Chapin as Command (Nuclear Emergency Search Team)
Peter McRobbie as Electronics (Nuclear Emergency Search Team)
Warren Keith as Computers (Nuclear Emergency Search Team)
Bruce Jarchow as Interogator (Nuclear Emergency Search Team)
Stephen Markle as Interogator (Nuclear Emergency Search Team)
Al Cerullo as Helicopter Pilot (Nuclear Emergency Search Team)
Richard Jenkins as Radiation Controls Officer (Medatomic Lab)
Sully Boyar as Ben Night Guard Medatomics Lab
Timothy Carhart as Charlie Relief Guard Medatomic Lab
Fred Melamed as Howard Guard Medatomics Lab
Warren Manzi as Day Attendant Medatomics Lab
Michael Telesco as Receptionnist Medatomic Lab
Frank Ferrara as SWAT Team (Medatomics Lab)
Jimmie Ray Weeks as SWAT Team (Medatomics Lab)
William Weslow as SWAT Team (Medatomics Lab)
Dan Butler as SWAT Team (Medatomics Lab)
Steve Zettler as SWAT Team (Medatomics Lab)
Richard Caselnova as SWAT Team (Medatomics Lab)
Craig Austin as Bus heckler
Deborah Gibson as Extra