John Mathewson

John Lithgow

Paul Stephens

Christopher Collet

Jenny Anderman

Cynthia Nixon

Elizabeth Stephens

Jill Eikenberry

Lt. Col. Conroy

John Mahoney

Night Guard

Sully Boyar

Radiation Controls Officer

Richard Jenkins

Government

Richard Council

Max

Robert Sean Leonard

Government Aide

Robert Schenkkan

General

Paul Austin

Laser Efficiency Kid (as Richard Cardona)

Steve Blum

Scientist

Adrian Sparks

Jenny's Parent

Sarah Burke

Scientist

Curt Dempster

Lab Assistant

Bran Ferren

Lab Assistant

Brian Ferren

Science Teacher

Greg Edelman

Science Teacher

Gregg Edelman

Assay Technician

Fred Melamed

Roland

Abe Unger

Max

Robert E. Leonard

Tennis

David Quinn

Craig

Geoffrey Nauffts

Emma

Katherine Hiler

Terry

Trey Cummins

Local FBI

Steve Borton

Local FBI

Harlan Cary Poe

Jenny's Brother

Allen DeCheser

Jenny's Parent

Ned Schmidtke

Conroy's Lieutenant

Fred G. Smith

Eccles

John David Cullum

Moore

Manny Jacobs

Price

Charlie Fields

Saito

Eric Hsiao

Flirting Kid

Heather Dominic

Halley's Comet Kid

Trevor Bolling

Flirting Kid

Bruce Smolanoff

Registrar

Joan Kendall

Cabbie

John Doumanian

Injection Doctor

Tom Tarpey

FBI

Alec Massey

FBI

Edward D. Murphy

FBI

Dee Ann McDavid

TV Reporter

Joan Harris

Himself

Kerry Donovan

Command

Ken Chapin

Electronics

Peter McRobbie

Computer

Warren Keith

Interrogator

Bruce Jarchow

Interrogator

Stephen Markle

Helicopter Pilot

Al Cerullo

Relief Guard

Timothy Carhart

Day Attendant

Warren Manzi

Day Security Receptionist

Michael Telesco

SWATS

Frank Ferrara Sr.

SWATS

Jimmy Ray Weeks

SWATS

William Weslow

SWATS

Dan E. Butler

SWATS

Steve Zettler

SWATS

Richard Caselnova

Flirting Kid

Heather Rose Dominic

Director

Marshall Brickman

Director

Marshall Brickman