- Jacqueline Beer - Suzanne Fabray
- Jacqueline Beer - Suzanne Fabry
- Roger Smith - Jeff Spencer
- Roger Smith - Jeff Spencer (voice) (uncredited)
- Whitney Blake - Diana Carthwright
- Kenneth Tobey - Coach Jarech
- Linda Darnell - Zina Felice
- Mako - Ito Nakayama
- Jo Van Fleet - Jane Patterson
- Johnny Grant - Self
- Jim Backus - Maury Samuels
- Kent Smith - Robert Vincent
- Roberto Contreras - Santos
- Gena Rowlands - Barbara Adams
- Lee Patrick - Nona Rumson
- Ben Welden - Benny Hayt
- Peter Marshall - Charles Bell
- Chick Chandler - Eddie Carlisle
- Peter Lorre - The Gypsy
- Max Baer Jr. - Government Man
- William Hudson - Phillip Marsden
- Majel Barrett - Ilsa Grosch
- Margaret Hayes - Connie Lansing
- Bruce Cabot - Silk Cipriano
- Ellen Burstyn - Betty Benson
- Ellen Burstyn - Sandra Keene
- Phillip Terry - MIke Lamson
- Marisa Pavan - Anna
- Elaine Devry - Jennie Day
- Grady Sutton - Doorman
- Pat Crowley - Johanna Martin
- William Schallert - Steve Alexander
- Sue Ane Langdon - Polly Wills
- James Garner - Self
- William Forrest - Graham
- Andrea King - Claudine
- H.M. Wynant - Jerry Brent
- Grace Lee Whitney - Natasha
- Leslie Parrish - Jody (uncredited)
- Alvy Moore - Adam Gallante
- Dyan Cannon - Kathy
- Dyan Cannon - Sheila
- Carole Mathews - Mrs. Elaine Lamson
- Dawn Wells - Judy Rogers
- Bea Benaderet - Mary Field
- Albert Carrier - Claude
- Dale Van Sickel - Josef
- Dale Van Sickel - The Hood
- Elizabeth Montgomery - Charlotte Delavalle
- Donald May - Tip Lanahan
- Nancy Kulp - Hilda McDougall
- Dianne Foster - Connie Beck
- Gerald Mohr - Carlos Traynor
- Dorothy Provine - Nora Shirley
- Barbara Lang - Alice Blake
- Jay Novello - Yegor Danilov
- Jay Novello - Mr. Neidorf
- Jay Novello - Rudolf Weisner
- Raymond Bailey - Steven Stewart
- Raymond Bailey - Philip Harkins
- Van Williams - Ken Madison
- Fortunio Bonanova - Santos
- Edward Platt - Mr. Jacobin
- Andrew Duggan - Cal Calhoun
- Andrew Duggan - Insp. Eric Sommers
- Neil Hamilton - Hamilton Rondave
- Neil Hamilton - John Harrington
- Neil Hamilton - Mr. Renaldo
- Norma Varden - Maude Courtright
- Norma Varden - Mrs. Hotchkiss
- John Litel - Colonel Richard Gaunt
- George Murdock - Frank Syden
- Dub Taylor - Man Tourist
- Sherry Jackson - Carrie
- Warren Oates - Dink Strahman
- Walter Reed - Bill Foster
- Richard Long - Rex Randolph
- Richard Long - Dick Lynwood
- Louis Mercier - Robert
- Ruta Lee - Katie Moran
- Herb Vigran - Photographer (uncredited)
- Herb Vigran - Augie
- Jock Mahoney - Barry James
- Irving Bacon - Apt. House Manager
- Elena Verdugo - Karen Keddy
- George J. Lewis - Doctor Ramon Santos
- Louise Glenn - Barrie
- Belle Mitchell - 1st Harpy
- William Windom - Calvin Otterman
- Pat Woodell - Polly Winston
- Nancy Walters - Lenore Lombard
- Herbert Marshall - Father Anthony
- Richard Conte - Detective Lieut. Butter
- Larry Merrill - Surfer
- William Shatner - Paul DeVinger
- Jimmy Murphy - Leroy
- Billy E. Hughes - Terry Nilson (as Billy Hughes)
- Bobby Jordan - Auto Mechanic (uncredited)
- Herbert Lytton - Claims Investigator (uncredited)
- Fay Baker - Caroline Kinares
- Alberto Morin - Inspector Fayolle
- Alberto Morin - Robaire
- Harry Harvey - Judge Hansen
- Harry Harvey - The Squatter
- Norbert Schiller - Dieter
- Norbert Schiller - Father Cyna
- Anthony George - Nick Hercules
- William Edmunds - Papa Puccini
- Joseph Ruskin - Dimitri (uncredited)
- Walter Slezak - Oskar Pauker
- Ed Wynn - Feigenstein
- Keenan Wynn - Lolly
- Connie Stevens - Cricket Blake (uncredited)
- Connie Stevens - Cricket Blake
- Paul Picerni - Bruno Cestari
- Telly Savalas - Brother Hendricksen
- Cesar Romero - Lorenzo Cestari
- Tony Bennett - Maximillian
- Mario Siletti - Italian Agent
- Virginia Gregg - Helen Johnson
- Virginia Gregg - Trudie Vogel
- Eric Braeden - German Soldier (uncredited)
- Penny Santon - The Mother Leader
- Penny Santon - Mrs. Neuman
- Robert Colbert - Phil
- Robert Colbert - Ernie Pozen
- Robert Colbert - McHenry
- Brian Keith - Sgt. Patrick Cohan
- Julie Adams - Marie La Shelle
- Julie Adams - Norma Kellogg
- Clint Walker - Cal Jasper
- William Conrad - Bystander (uncredited)
- John Banner - Carl Neuman
- Hardie Albright - Lawrence Tiburon
- John Vivyan - Mitch Abercrombie
- Jackie Coogan - Baldy Mike Hannigan (uncredited)
- Lisa Montell - Pilar Sanchez
- Victor Buono - Bennie
- Victor Buono - Gunther
- Robert Shayne - Stephen Allen
- John Eldredge - Dr. Link Cowan
- John Harmon - Simmons (uncredited)
- John Hubbard - Laroque
- John Hubbard - Art Moomey
- John Hubbard - Charles Lane
- John Hubbard - Police Sergeant (uncredited)
- John Hubbard - R.A. Winterbottom
- Alan Marshal - Noel Reynolds
- Ellen Corby - Martha Ward
- Frank De Kova - Jack Bent
- Frank De Kova - Jerry Gordon
- Bartlett Robinson - Dean Hartley
- Fred Stromsoe - Messenger (uncredited)
- Eric Feldary - Eric House
- Lester Matthews - Mr. Craythrope
- Lester Matthews - Inspector T. Carnahan
- Lester Matthews - Pillsbury
- Byron Keith - Lt. Roy Gilmore
- Byron Keith - Lt. Roy Gilmore (as Keith Byron)
- Myrna Fahey - Janie Maynor Benton
- Myrna Fahey - Helen Charles (uncredited)
- Myrna Fahey - Woman in Ladies' Lounge (uncredited)
- Myrna Fahey - Lynn Wells
- Myrna Fahey - Dolly Stewart
- Sarah Marshall - Harriet Hillbrook
- Reginald Gardiner - Mr. Maudlin
- Lou Krugman - Marco
- Lee Van Cleef - Majeski
- Abel Fernandez - Officer
- Lillian Bronson - Mrs. Bowers
- Dick Wessel - Stan
- Dick Wessel - Police Officer (uncredited)
- Cloris Leachman - Eve Winters
- Cloris Leachman - Connie Wingate
- Fay Wray - Clara Moore
- Tris Coffin - Dr. Alford
- Tris Coffin - Terry Wilson
- Jack Mather - J. Cedric Usher
- Robert Conrad - Tom Lopaka
- Robert Conrad - Tom Lopaka (uncredited)
- Don 'Red' Barry - Barnaby Allson
- Don 'Red' Barry - Rock
- Don 'Red' Barry - Shorty Adams
- Don 'Red' Barry - Frank Sully
- Troy Donahue - Sandy Winfield II
- Robert Logan - J.R. Hale
- Herbert Rudley - Henry Lane
- Herbert Rudley - Gerald Anderson
- Chuck Courtney - Walter Lochrie
- Robert Ellis - Harry Warren
- Claude Akins - Ed Bird
- Wayne Heffley - Red Helburn
- Sol Gorss - Brawler (uncredited)
- Poncie Ponce - Kim Quisado
- Poncie Ponce - Kim Quisado (uncredited)
- Alfred Shelly - Al Hutchinson
- Mary Tyler Moore - Marie Drew
- Mary Tyler Moore - Girl on Telephone (uncredited)
- Linda Lawson - Doris (uncredited)
- Linda Lawson - Jeanne
- Richard Reeves - Wilbur Van Brock
- Richard Reeves - Bartender (uncredited)
- Richard Reeves - Sergeant MacNamara
- Dayton Lummis - Guy Winters
- Sherwood Price - Jonny Malaris
- John Dehner - Roland Dumont
- John Dehner - Robert McGill
- John Dehner - John Dehner
- Jack Daly - Salesman
- Valerie Allen - Margie Wilson
- Naura Hayden - Alice Beasley
- Alexander Campbell - Silas Rocklin
- Donald Buka - Pierre Leclair
- Judy Nugent - Bobbie Anderson
- Charles Seel - Martin
- Charles Seel - George McHenry
- Susan Seaforth Hayes - Faith Merrick
- Stacy Harris - Carpie
- Will Wright - Luther Hanks
- Adam Williams - Chuck Lynch
- Adam Williams - Spud Morrison
- Adam Williams - Willie Lee Hanks
- Adam Williams - Axel Derwent
- Elizabeth MacRae - Bette Otterman
- Richard Shannon - Carl Loomis
- Mel Prestidge - Charles Puana (uncredited)
- Don C. Harvey - Paul Coyne
- Don C. Harvey - Wildcat Torrance
- Michael St. Clair - Waiter
- Forrest Compton - Harry Tiburon
- Forrest Compton - Steve Culver
- Forrest Compton - Owen Frazer (uncredited)
- Natalie Schafer - Ellie Fraser
- Douglas Henderson - Reginald Stanhope (uncredited)
- Douglas Henderson - Dr. Robert Lawrence
- John Astin - Martin Grosch
- Lisabeth Hush - Audrey Lawrence
- John Sebastian - Lennie Paris
- John Sebastian - Pierre Picard
- John Dennis - Stan Billings
- John Dennis - Jack Metz
- Rosemary DeCamp - Nurse (uncredited)
- Robert J. Wilke - Vern Reece
- Joseph Mell - Neville Jennings
- George E. Stone - Mr. DeVinger
- Damian O'Flynn - Cushing
- Damian O'Flynn - Mr. Cadwell
- Will Hutchins - Emcee
- Will Hutchins - Self
- Tom Kennedy - Night Watchman (uncredited)
- Joanna Barnes - Lisa Cabot
- Bobby Troup - Vic Connors
- Art Balinger - Lieut. Tate
- DeForest Kelley - Phil Wingate
- Anthony Eustrel - Mainwaring (uncredited)
- Anthony Eisley - Tracy Steele (uncredited)
- Anthony Eisley - Tracy Steele
- Richard Deacon - Wallace Friend
- Marjorie Bennett - Bessie St. Clair
- Marjorie Bennett - Arlene Glascoe
- Milton Frome - Walter Glascoe
- Fred Essler - Max, the Bookkeeper
- Fred Essler - Papa Eros
- John Daheim - Blake
- Gary Vinson - Rod Jenning
- Gary Vinson - Brad Curtis
- Roger Moore - Radio Announcer (voice) (uncredited)
- Roger Moore - Roger Moore
- Pamela Austin - Marilyn Sterling
- Arthur Franz - Lieutenant Rudy
- Arthur Franz - Dr. Alex Conley
- Diane McBain - Carla Stevens
- Diane McBain - Nita Maran
- Diane McBain - Laura Stanley
- Diane McBain - Lu-Ann Lynwood
- Diane McBain - Paula Harding
- Diane McBain - Doris Spinner
- Rachel Ames - Agnes Hoyt
- Paul Bryar - Inspector Laporte
- Paul Bryar - Ed Sudano
- Harold J. Stone - Lou Catto
- Harold J. Stone - Lt. John Frazier
- Nancy Malone - Kathy Frazier
- Ted de Corsia - Blackie
- Ralph Manza - Michael Dietz
- Ralph Manza - Patsy Coniglio
- Strother Martin - Charles Sloane
- Oliver McGowan - McManus
- Eve McVeagh - Elizabeth Dawson
- John Cliff - Cop
- Anne Whitfield - Lillis Todd
- Jean Allison - Dorothy Amboy
- Jean Allison - Francie Sheldon
- Jean Allison - Helen Schmidt
- Robert Foulk - Emil Seley
- Brad Weston - Babe
- Brad Weston - Dr. Langton
- Shirley Knight - Mari Ellen Taylor
- Bill Zuckert - Capt. Edward Brandmeier
- Bill Zuckert - Sgt. Keough
- Norman Alden - Rene
- Karl Held - Gordon Vancott
- Alan Hewitt - Frank King
- Lennie Weinrib - Joe Chiappardo
- Mike Henry - Sgt. Johnny Rossi
- Mike Henry - Desk Sergeant (uncredited)
- Jay Adler - Dave Levenson
- Leonid Kinskey - Pete Kramer
- Dorothy Konrad - Woman Student
- Nick Dimitri - Man (uncredited)
- Nick Dimitri - Photographer (uncredited)
- Jorge Moreno - Manuel
- Bill Quinn - Eugene Seaver
- Bill Quinn - Herb Bowerman
- John Baer - William T. Hart
- Robert Vaughn - Douglas Milinder
- Keith Richards - Johnson
- Keith Richards - Allan Joyce
- Keith Richards - Louis Louis
- Keith Richards - Herbert Dolan
- Buddy Ebsen - Baxter Kellogg
- Joel Grey - Joey Kellogg
- John Russell - Mechanical Cowboy (voice) (uncredited)
- Robert Armstrong - Pop Bateman
- Ron Hagerthy - Percy
- Nancy Gates - Sandra Carter
- Kathleen Hughes - Florence Callahan
- Harvey Stephens - Sid De Forest
- Skip Ward - Victor King
- Percy Helton - Hotel Desk Clerk (uncredited)
- Elinor Donahue - Laura Holt
- Brad Johnson - Lee Travis
- William T. Orr
- Jack Webb
Cesar Romero interpreta a Lorenzo Cestari en la serie.
Jay Adler interpreta a Dave Levenson en la serie.
Richard Conte hace el papel de Detective Lieut. Butter.
Leonid Kinskey interpreta a Pete Kramer en la serie.
Peter Lorre interpreta a The Gypsy en la serie.
Robert J. Wilke interpreta a Vern Reece en la serie.
Ted de Corsia interpreta a Blackie en la serie.
Adam Williams interpreta a Chuck Lynch en la serie.
Edward Platt hace el papel de Mr. Jacobin.
George E. Stone hace el papel de Mr. DeVinger.
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