John Robinson
Maureen Robinson
Judy Robinson
Penny Robinson
Will Robinson
Dr. Smith / Spider Smith
Don West
Older Will
General
Jeb Walker
Reporter #1
Principal
Businessman
Lab Technician
Reporter #2
Noah Freeman
Annie Tech
Attack Pilot
Robot (voice)
Blawp (voice) (as Gary Hecker)
Spider Smith (Shadow) (as William Todd Jones)
Boy on Earth (uncredited)
Space Cadet Reporter (uncredited)