Ken Berry
Frank
Sandy Duncan
Liz
Harry Morgan
General Stilton
Roddy McDowall
Mr. Stallwood
McLean Stevenson
Link
Jesse White
Earnest Ernie
Alan Young
Dr. Wenger
Hans Conried
Dr. Heffel
Ronnie Schell
Jake (Voice) / Sgt. Duffy
James Hampton
Capt. Anderson
Howard Platt
Col. Woodruff
William Prince
Mr. Olympus
Ralph Manza
Weasel
Tom Pedi
Honest Harry
Hank Jones
Officer
Rick Hurst
Dydee Guard
John Alderson
Mr. Smith
Alice Backes
Farmer's Wife
Henry Slate
Sandwich Man
Jerry Fujikawa
2nd E.R.L. Expert
Jim Begg
Dydee Driver
Peter Renaday
Bailiff
Joseph G. Medalis
Sucker
Gil Stratton
1st NASA Scientist
Sorrell Booke
Presiding Judge (uncredited)
Jackson Bostwick
Additional Voices (voice) (uncredited)
Tiger Joe Marsh
Omar
Arnold Soboloff
NASA Executive
Mel Carter
1st Soldier
Dal McKennon
Farmer
Roger Pancake
Red
Roger Price
1st E.R.L. Expert
Rickie Sorensen
Technician
Tom Jackman
Army Engineer
Fred L. Whalen
Sarasota Slim
Jana Milo
2nd NASA Scientist
