Cast

• Ronnie Schell: Jake (voice)/Sgt. Duffy
• Ken Berry: Dr. Franklin 'Frank' Wilson
• Sandy Duncan: Dr. Elizabeth 'Liz' Bartlett
• Harry Morgan: Gen. Stilton
• Roddy McDowall: Mr. Stallwood
• McLean Stevenson: Dr. Norman Link
• Jesse White: Earnest Ernie (the Gambling Dealer)
• Alan Young: Dr. Winger (veterinarian)
• Hans Conried: Chief Dr. Heffel
• James Hampton: Capt. Anderson
• Howard Platt: Col. Woodruff
• William Prince: Mr. Charlie Olympus
• Ralph Manza: Weasel
• Tom Pedi: Honest Harry
• Hank Jones: Officer