- Mike Mazurki - Loach
- Don Collier - Mr. Bara
- Alex Dreier - Kronig
- George Mitchell - Harry Cass
- Jay Novello - Okun
- Doodles Weaver - Giant Hobo
- Billy Halop - Bartender Harry
- Wesley Lau - Policeman
- Elizabeth Rogers - Secretary
- Whit Bissell - Dr. Krane
- Joan Freeman - Mara
- Kimberly Beck - Giant Girl
- Celeste Yarnall - Marna Whelan
- Michael Ansara - Murtrah
- Myron Healey - Second Giant
- Vic Tayback - Hood
- Michael Anderson Jr. - Ben Car
- Tol Avery - Mr. Derg
- Lance LeGault - Giant Policeman
- Fritz Feld - Quigg
- Arthur Franz - Dr. Franzen
- Broderick Crawford - Prof. Gorn
- Charles Drake - Mr. Erdap
- William Benedict - Villager Peabody
- Jonathan Harris - Mr. Piper
- Percy Helton - Akman
- Zalman King - Nick
- Vic Perrin - Giant Small Man Shoved by FitzHugh
- Charles Dierkop - Arthur Kamber
- Gene Dynarski - Warden Barmak
- Howard Culver - Curator
- Peter Haskell - Enog
- Guy Stockwell - Garak
- Peter Mark Richman - Dr. Marad
- Yvonne Craig - Berna
- Torin Thatcher - Dr. Berger
- William Schallert - Dr. Arno
- Clint Ritchie - Andros
- Kent Taylor - Doc Jelko
- Glenn Corbett - Major Kagan
- Sugar Ray Robinson - Biff Bowers
- Sam Elliott - Martin Reed
- John Zaremba - Dr. Lalor
- Kevin Hagen - Insp. Dobbs Kobick
- Alfred Ryder - Parteg
- Peter Leeds - Senator
- Peter Jason - Mylo
- Arthur Batanides - Luigi
- Paul Carr - Giant Photographer
- Norman Burton - Sergeant
- John Abbott - Prof. Gorak
- Larry Ward - Talf Ekorb
- Ben Blue - Moley
- Len Lesser - Prisoner
- Robert H. Harris - Uncle Tojar
- Bob Braun - Balloon Vendor
- John Marley - Deputy Zarkin
- Madlyn Rhue - Bertha Fry
- Lane Bradford - Lobo
- Harry Lauter - Policeman
- Jerry Douglas - Fielder
- Mort Mills - Constable
- Diane McBain - Mrs. Evers
- John Pickard - Giant Guard
- Raymond Guth - Tramp
- Stuart Margolin - Zoral
- John Carradine - Egor Crull
- Ed Peck - Mike Warkin
- Nehemiah Persoff - Titus
- John Milford - Ranger Wilson
- Don Kennedy - Policeman
- Dennis Cross - Giant Policeman
- Christopher Dark - Sergeant Barker
- Garry Walberg - SID Man
- Joe Turkel - Sergeant
- Bruce Dern - Thorg
- Robert F. Lyons - Nalor
- Anne Seymour - Martha Cass
- Leonard Stone - Sgt. Eson
- Leonard Stone - Dr. Kraal
- Henry Corden - Janitor
- Gary Dubin - Dal Ekorb
- Gene LeBell - Mezron's Brother
- Malachi Throne - Taru
- Robert Colbert - Security Chief O. Bolgar
- Warren Stevens - Capt. Ashim
- Warren Stevens - Olds
- Paul Fix - Dr. Brulle
- John Dehner - Lieutenant Grayson
- Olan Soule - Cameraman
- John Harmon - Groom
- Tom Drake - SID Sergeant
- Parley Baer - Senator Obek
- Bill Quinn - Warden Sloan
- Jan Shepard - Osla Ekorb
- Lee Meriwether - Mrs. Bara
- Jesse White - Max Manfred
- Don 'Red' Barry - Dr. Zoral
- Tom Reese - Sgt. Gedo
- Richard Anderson - Joe Simmons
- Francine York - Dr. North
- Timothy Scott - Trilling
- Larry Pennell - Guard
- Don Watters - Giant Entomologist
- Cliff Osmond - Grotius
- Cliff Osmond - Jolo
- Baynes Barron - Giant Policeman
- Jerry Catron - Giant Sentry
- Jim Gosa - Giant Guard
- Jean-Michel Michenaud - Pepi
- Arch Whiting - Policeman
- Linden Chiles - Joe / Logar
- John Napier - Convict
- Morgan Jones - Assistant Scientist
- Grant Sullivan - Policeman
- Gary Tigerman - Delivery Boy
- Joe Ryan - Policeman
- Don Gazzaniga - Giant Watchman
- Ivan Markota - Sergeant
- Ivan Markota - Giant Fugitive
- Page Slattery - Scientist
- Tom Webb - Dolf
- Sheila Allen - Nurse Helg
- Sheila Allen - Miss Collier
- Jack Chaplain - Joey
- Lee J. Lambert - Hopper
- Paul Trinka - Officer
- Paul Trinka - Giant Guard
- Dave Dunlop - Giant Trapper
- Robert Dowdell - Policeman
- Paul Sorensen - Giant Camper
- Bill Fletcher - Sgt. Karf
- Ted Jordan - Policeman
- Ted Jordan - SID Man
- Jack Albertson - Prof. Kirmus
- Jack Albertson - Inidu
- Robert Emhardt - Mr. Secretary
- Teddy Quinn - Garna
- Sandra Giles - Dr. Greta Gault
- Sandra Giles - Harem Dancer
- Michael Freeman - Tobek
- Chris Alcaide - Sgt. Arnak
- Rico Cattani - SID Man
- Dee Hartford - Altha Franzen
- Stewart Bradley - Senior Scientist
- Stewart Bradley - Police Sergeant
- Peter Mamakos - Logar
- William Bramley - First Giant
- William Bramley - P.G. Hanley
- Denver Mattson - Sergeant
- Joseph Ruskin - Carlos
- Joseph Ruskin - General Aza
- Janos Prohaska - Gorilla
- Janos Prohaska - Gorilla - Bobo
- Jacques Aubuchon - Zurpin
- Ron Howard - Jodar
- Tony Benson - Grot
- Steven Marlo - Cop
- Steven Marlo - SID Officer Burns
- Steven Marlo - Technician
- Steven Marlo - Minor SID Official
- Buddy Foster - Tedar
- Roy Rowan - Newscaster
- Keith Taylor - Newsboy
- Patrick Sullivan Burke - Golan
- James Daris - Super Giant Robot
- Richard Carlyle - Special Policeman
- Willard Sage - Hook
- Willard Sage - Inspector Swan
- Arch Johnson - Chief Rivers
- Charlie Briggs - Guard
- Diana Chesney - Nell
- Michael Quinn - Watchman Jake
- Michael Quinn - Gateman
- Michael Quinn - Lt. Emar
- George Sperdakos - Goldsmith
- Oliver McGowan - Dr. Howard
- Tom Nardini - Carl
- Patrick Culliton - Policeman
- Patrick Culliton - SID Officer Willis
- Robert Shayne - Mr. Clinton
- Christopher Cary - Deenar
- James Jeter - Gateman
- Rex Holman - Mezron
- Jerry Quarry - Bron
- Scott Thomas - Messenger
- John Mooney - Pharmacist
- Robert Cornthwaite - Machine (voice)
- Peter Canon - Slave
- William Bassett - Ranger Jack
- June Dayton - Mrs. Perkins
- Robert Adler - Villager Sloacum
- Pete Kellett - Guard
- Alan Hale Jr. - O'Reilly
- Alan Bergmann - Krenko
- Eddie Marr - Peddler Brynie
- C. Lindsay Workman - Cunningham - Jeweler
- Dusty Cadis - Store Guard Warner Jr.
- Yale Summers - Andre
- Michael-James Wixted - Timmy
- Erik L. Nelson - SID Man
- Erik L. Nelson - SID Officer
- Edward G. Robinson Jr. - SID Guard Rogers
- Sean Kelly - Alek
- Frank Ferguson - Goalby
- Victoria Vetri - Lisa
- Robert Hogan - Brady
- Carl Carlsson - Knife Thrower
- Al Lampkin - Fire Eater
- Louise Lorimer - Miss Smith
- Susan Howard - Mrs. Garak
- Richard P. McDonagh
- Irwin Allen
- Lionel Newman
Percy Helton hace el papel de Akman.
John Marley hace el papel de Deputy Zarkin.
Joe Turkel interpreta a Sergeant en la serie.
Nehemiah Persoff interpreta a Titus en la serie.
Kimberly Beck hace el papel de Giant Girl.
Jack Albertson hace el papel de Prof. Kirmus.
Leonard Stone interpreta a Sgt. Eson en la serie.
Don Marshall interpreta a Dan Erickson en la serie.
Heather Young interpreta a Betty Hamilton en la serie.
Don Matheson interpreta a Mark Wilson en la serie.
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