King Triton (voice)
Marshal
Inspector Kemp
Franz Liebkind
Woolly Bill Hitchcock
Grandpa (voice)
Mr. Crisp
Hugh Simon
Nick
Grandpa / Lambeosaurus (voice)
Mr. Bobrucz
Stanton Boyd
Cmdr. Drury
Dr. Charlie Rollins
Magician
Dr. Sam Gillison
Former FBI Agent Will
Hal B. Keeler
Broker
Les Hopkins
A.J. Norbecker
The Coach - Principal Cleveland
Self
Gene Molinari
Paul Wrightwood
Mitchell Bernard
Professor Von Trapp (voice) (archive footage)
Dr. Julius Roth
Director / Dogcatcher (voice)
Smokey
Otto Bentwood
Mr. Kolenkhov
Lyndon Johnson
Dr. Arnold Bowman
Uncle Al
King Colbert (voice)
Vultor / Walt (voice)
Lou
Ben Fryer
Max Mencken
Professor Screweyes (voice)
Robert E. Sherwood
Grandpa Longneck
Mayor
Old Gorilla (voice)
Reverend Farrell
Reverend Pete
Rabbi Baumel
Inspector Kemp (archive footage)
Grandpa / Parasaurlophus (voice)
Kruse
Red Hewitt
Sweet William (voice)
Mr. Tinsley
Judge John Zimring
Mike
Poppa Grundov
Douglas Veenhof
Benny
Otto Mannkusser
Lester De Ville
Officer Callahan
Wallace Carstairs
Narrator
Clyde Hayes
Melvin
Gunther
Fetch
Uncle Sid
Quickclaw (voice)
Sen. Donner
Uncle Louis Burton
Richard (voice)
M2 (voice)
Sgt. Turnbuckle
Harry Zarakardos
Dr. Hunterhanker (voice)
Director
(voice)
William Tarkington IV
Ridley
Son
Jim Sutton
Mercer
Heimlich Menudo (voice)
Buzz (voice)
Buzz / Heimlich Menudo (voice)
Beethoven (voice)
Ace Atkins
Colyus
Mark Wyndham
Judge
Dr. Pratt
Ronald Bishop
Self - Guest / Various Characters
Auric (voice)
Dr. Thursby
Additional Voices
Manny Ziegler
Joshua T. Albertson
Narrator (voice)
Lou Granite
The Camel with the Wrinkled Knees
Clown
Horst
Marty
Hemsley Post
Colonel Von Blasko