Ed Klingbottom

Thomas F. Wilson

Roy Dubro

Karim Prince

Junior Assistant Dispatch Trainee Stanley Snyder

M. Emmet Walsh

Air Force

Brion James

Dr. Strangemeister

Wigald Boning

Men in Strangemeister's Head

Ben Stein

General Vice

George Kennedy

Press Secretary

Donna D'Errico

President Smith

Barry Bostwick

Glaxxon

Rodger Halston

Old Bob

Don Stroud

G-Man

John Bishop

Girl Scout Leader

Patricia Elliott

Female Reporter #1

Melissa Rivers

Glaxxon (voice)

Dave Fennoy

Subordinate Alien (voice)

Dee Bradley Baker

Jennifer Coolidge

Alien #1

Charles Philip Moore

Female Reporter #2

Amy Kidd

Secret Service Agent

Michael McDonald

Manny Fernandez

Alien

Carlos Bernard

Lifeguard

Rob Kerchner

Alien #1 (voice)

Danny Mann

Alien #2 (voice)

Susan Silo

Bobby Edner

Spock

Michael Reardon

Bikini Girl

Mary Ann Schmidt

John Wayne Gacy's 'Pogo the Clown' (uncredited)

Seth Bailey

Dr. Strangemeister (voice) (uncredited)

Rob Paulsen