Joey Cramer
David Scott Freeman
Paul Reubens
Max (voice)
Veronica Cartwright
Helen Freeman
Cliff DeYoung
Bill Freeman
Sarah Jessica Parker
Carolyn McAdams
Matt Adler
Jeff (16 years)
Howard Hesseman
Dr. Louis Faraday
Robert Small
Troy
Jonathan Sanger
Dr. Carr
Richard Liberty
Mr. Howard
Raymond Forchion
Detective Banks
Cynthia Caquelin
Woman Officer
Ted Bartsch
Night Guard Brayton
Brigid Cleary
Technician #2
Michael Strano
Technician #3
Parris Buckner
Scientist #1
Robyn Peterson
Scientist #2
Philip Hoelcher
NASA Officer
Julio Oscar Mechoso
Hangar Guard #1
Butch Raymond
Hangar Guard #2
Chase Randolph
Lieutenant King
John Archie
Agent #1
Tony Calvino
Agent #2
Rusty Pouch
Gas Station Attendant
Robert Goodman
Tourist Man
Peter Lundquist
Newscaster #1
Jill Beach
Newscaster #2
Kenneth Ian Davis
Kid in Mustang
Arnie Ross
NASA Technician
Fritz Bronner
NASA Technician
Albie Whitaker
Jeff 8 year