- Jerry Ayres - Marvin
- Richard Erdman - Manny
- Iggie Wolfington - Petrov
- Harold J. Stone - Shenko
- Luciana Paluzzi - Mala Valenska
- Kathie Browne - Julia / 'Mr. Big'
- Fabian Dean - 1st Hood
- Troy Melton - 2nd Hood
- David Opatoshu - The Psychiatrist
- Susan Seaforth Hayes - June
- Susan Seaforth Hayes - Gloria
- Foster Brooks - 1st Man
- Ellen Corby - Mrs. Walters
- Eileen Wesson - Nurse
- John J. Fox - 1st Policeman
- Russ Grieve - 2nd Policeman
- Bill Quinn - Pilot
- Michael Rye - President
- Benny Rubin - Abdul
- Henry Corden - Butler
- Marjorie Eaton - Princess
- Howard Wendell - Mr. Thornton
- Lillian Adams - Girl in Shop
- Paul 'Mousie' Garner - Tailor
- Chuck Courtney - Gentleman
- Jay Novello - Count Gregory
- Lee Bergere - Claude
- Richard Dawson - Max
- Joan Huntington - Nina
- Paul Bryar - Henri
- Ned Glass - Dr. Reynolds
- Ned Glass - The Scientist
- Will J. White - Guard
- Will J. White - Co-Pilot
- Barbara Stuart - Dolly
- Robert Strauss - Carl
- Mike Mazurki - Shoulders
- Leo Gordon - Archie Thompson
- Joyce Jameson - The Girl
- Charles Dierkop - Tiger
- John Indrisano - Referee
- Vince Williams - Announcer
- Steve Mitchell - 1st Hood
- King Moody - 2nd Hood
- Ronnie Rondell Jr. - Killer Kane
- Billy Holms - Photographer
- Richard X. Slattery - Blackjack Clayton
- Joyce Van Patten - Margo
- Clancy Cooper - Police Sergeant
- Marianne Gordon - Girl in Station
- Marianne Gordon - Gladys
- Chuck Roberson - Dawson
- Barrie Chase - Tanya
- Dick Wilson - Chef
- Margaret Shinn - June
- Peter Leeds - Leonid
- Henry Brandon - Herman von Brock
- Emily Banks - Carol
- Louis Cavalier - Gas Station Customer
- Debbie Watson - Jenny May
- Florence Lake - Maw
- Dub Taylor - Preacher
- Dan Kemp - Thornton
- John Mitchum - Harry
- William Fawcett - Grandpa
- Clay Tanner - Zeke
- Arnold Moss - Victor / Dr, Chelsey
- Jill Donohue - Lorna
- Lloyd Kino - Dr. Toki
- Albert D'Arno - Dr Dubrey
- Henry Wills - Chauffeur
- Magda Harout - Doris
- Richard Reeves - Arnold
- Leslie McRay - Sally
- Christopher Dark - Basil
- Val Avery - Leo
- Jim Creech - Mike Roberts
- Don Marshall - Athlete
- Michael Forest - Valmar
- Savannah Bentley - Hal's Date
- Harry Hickox - Coach
- Ziva Rodann - Christina
- John Vivyan - Boris Boraser (Ambassador)
- Ulla Strömstedt - Tanya
- Michael Pataki - Andre
- Cliff Norton - Dr. Schmidt
- Susanne Cramer - Teresa
- Dort Clark - The Circus Boss
- Ted Cassidy - Bojo
- Carmelo Manto - Adam Sylvester
- Frank Delfino - Tiny
- Robert Miller Driscoll - The Sultan
- Than Wyenn - Marco
- Len Lesser - Novnik
- Nancy Walters - Bonbi
- Nancy Dow - Redhead
- Roy Rowan - TV Announcer
- Linda Burton - Messenger Girl
- David Carlile - Detective
- Lisa Pera - Vera
- Peter Dawson - Police Captain
- Sammy Shore - Lou
- Jack Arnold
Val Avery hace el papel de Leo.
Stephen Strimpell hace el papel de Stanley Beamish.
Richard Gautier interpreta a Hal Walters en la serie.
John McGiver interpreta a B. J. Reed en la serie.
Paul Smith interpreta a Harley Trent en la serie.
Paul Frees hace el papel de Narrator.
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