约翰·利思戈

John Lithgow

饰：Dr. John Mathewson

格雷格·埃德尔曼

Gregg Edelman

饰：Science Teacher (Ithaca)

罗伯特·申坎

Robert Schenkkan

饰：Government Aide (University Lab)

Paul Austin

Paul Austin

饰：General (University Lab)

理查德·肯索尔

Richard Council

饰：Government (University Lab)

Curt Dempster

饰：Scientist (University Lab)

辛西娅·尼克松

Cynthia Nixon

饰：Jenny Anderman (Ithaca)

吉尔·艾肯伯里

Jill Eikenberry

饰：Elizabeth Stephens (Ithaca)

艾德里安·斯帕克斯

Adrian Sparks

饰：Scientist (University Lab)

克里斯托弗·科莱特

Christopher Collet

饰：Paul Stephens (Ithaca)

Abraham Unger

Abraham Unger

饰：Roland (Ithaca) (as Abe Unger)

布兰·费伦

Bran Ferren

饰：Lab Assistant (University Lab)

弗雷德·迈拉麦德

Fred Melamed

饰：Howard, Guard Medatomics Lab

黛伯拉·吉布森

Deborah Gibson

饰：Extra (uncredited)

丹·巴特勒

Dan Butler

饰：SWAT Team (Medatomics Lab)

皮特·麦克罗比

Peter McRobbie

饰：Electronics (Nuclear Emergency Search Team)

约翰·多马尼安

John Doumanian

饰：Cabbie (Science Fair)

Edward D. Murphy

Edward D. Murphy

饰：FBI (Science Fair)

理查德·詹金斯

Richard Jenkins

饰：Radiation Controls Officer (Medatomic Lab)

JD·库鲁姆

JD Cullum

饰：Eccles (Science Fair)

Craig Austin

饰：Bus heckler (uncredited)

罗伯特·肖恩·莱纳德

Robert Sean Leonard

饰：Max (Ithaca) (as Robert Leonard)

蒂莫西·卡哈特

Timothy Carhart

饰：Charlie, Relief Guard Medatomic Lab

Richard Caselnova

饰：SWAT Team (Medatomics Lab)

沃伦·凯斯

Warren Keith

饰：Computers (Nuclear Emergency Search Team)

Harlan Cary Poe

饰：Local FBI Agent (Ithaca)

吉米·雷·威克斯

Jimmie Ray Weeks

饰：SWAT Team (Medatomics Lab)

布鲁斯·雅霍夫

Bruce Jarchow

饰：Interogator (Nuclear Emergency Search Team)

Frank Ferrara

Frank Ferrara

饰：SWAT Team (Medatomics Lab)

Allen DeCheser

饰：Barnaby, Jenny's Brother (Ithaca)

Bruce Smolanoff

Bruce Smolanoff

饰：Flirting Kids (Science Fair)

约翰·马奥尼

John Mahoney

饰：Lt. Colonel Conroy (Science Fair)

Manny Jacobs

饰：Moore (Science Fair)

尼德·施密特克

Ned Schmidtke

饰：Jenny' Father (Ithaca)

Ken Chapin

饰：Command (Nuclear Emergency Search Team)

阿尔·赛鲁罗

Al Cerullo

饰：Helicopter Pilot (Nuclear Emergency Search Team)

苏利·伯维尔

Sully Boyar

饰：Ben, Night Guard Medatomics Lab

多米尼克

Heather Rose Dominic

饰：Flirting Kids (Science Fair) (as Heather Dominic)

Geoffrey Nauffts

饰：Craig (Ithaca)

Steve Zettler

饰：SWAT Team (Medatomics Lab)

Joan Harris

饰：Barbara Collins (Science Fair)

Stephen Markle

饰：Interogator (Nuclear Emergency Search Team)

Tom Tarpey

饰：Injection Doctor (Science Fair)

Steve Borton

Steve Borton

饰：Local FBI Agent Ithaca

Charles Fields

饰：Price (Science Fair)

David Quinn

David Quinn

饰：Tennis (Ithaca)

William Weslow

William Weslow

饰：SWAT Team (Medatomics Lab)

Michael Telesco

Michael Telesco

饰：Receptionnist Medatomic Lab

沃伦·曼齐

Warren Manzi

饰：Day Attendant, Medatomics Lab

Kerry Donovan

Kerry Donovan

饰：Himself - WBNG News (Science Fair)

Dee Ann McDavid

Dee Ann McDavid

饰：FBI (Science Fair)

Alec Massey

Alec Massey

饰：FBI (Science Fair)

Joan Kendall

Joan Kendall

饰：Registrar (Science Fair)

Trevor Bolling

Trevor Bolling

饰：Halley's Comet Kid (Science Fair)

Eric Hsiao

Eric Hsiao

饰：Salto (Science Fair)

Fred G. Smith

Fred G. Smith

饰：Conroy's Lieutenant (Science Fair)

Arthur De Cheser

Arthur De Cheser

饰：Barnaby, Jenny's Brother (Ithaca)

Sarah Burke

Sarah Burke

饰：Jenny's Mother (Ithaca)

Trey Cummins

Trey Cummins

饰：Terry (Ithaca)

Katherine Hiler

Katherine Hiler

饰：Emma (Ithaca)

史蒂夫·布鲁姆

Steven Blum

饰：Laser Efficiency Kid,(as Richard Cardona)