Season Four
- #96: The Case of the Treacherous Toupee 9/17/60
- Peggy Converse as Sybil Basset
- Philip Ober as Peter Dawson
- Bert Freed as Ken Woodman
- Cindy Robbins as Teddi Hart
- Thomas B. Henry as Hartley Basset
- Robert Redford as Dick Hart
- Nelson Olmsted as Arthur Colemar
- Dee Arlen as Lorna Grant
- Jonathon Hole as Stanley Roderick
- Frank Wilcox as Judge
- Lindsay Workman as Wilber Fenwick
- Juney Ellis as Lucy
- Rita Duncan as Flo
- Hal Smith as Supper Club Owner
- Len Hendry as Plainclothesman
- George E. Stone as Court Clerk
- Lee Miller as Sgt. Brice
- Patricia Marlowe as Receptionist
- #97: The Case of the Credulous Quarry 9/24/60
- Katherine Squire as Clara Thorpe
- Russell Arms as Everett Dorrell
- John Conwell as Richard Hammond
- Vinton Hayworth as Marvin Claridge
- Walter Reed as Alex Hill
- Nan Peterson as Barbara Claridge
- Russ Bender as Policeman
- Willis Bouchey as Judge
- Fred Graham as Fire Chief
- Renee Godfrey as Miss Winslow
- Bart Conrad as Autopsy Surgeon
- George E. Stone as Court Clerk
- #98: The Case of the Ill-Fated Faker 10/1/60
- William Campbell as Jim Ferris
- Kenneth Tobey as Prosecutor
- June Dayton as Alice Gorman
- Sue Randall as Betty Wilkins
- Howard Petrie as Carl Gorman
- James Anderson as Stan Piper
- Tyler McVey as Harold Ames
- Sarah Selby as Mrs. Ames
- S. John Launer as Judge
- Pitt Herbert as Autopsy Surgeon
- George E. Stone as Court Clerk
- #99: The Case of the Singular Double 10/8/60
- Harry Townes as Grosvenor Cutter
- Connie Hines as Lucy Stevens
- Arch Johnson as John Ruskin
- Alan Baxter as Whitney Locke
- Andrea King as Catherine Locke
- Wilton Graff as Hugo Burnette
- Mary Webster as Marjorie Ralston
- Morris Ankrum as Judge
- Michael Fox as Autopsy Surgeon
- Sue England as Switchboard Girl
- Richard Geary as Skin Diver
- #100: The Case of the Lavender Lipstick 10/15/60
- Joe Maross as Ernest Helming
- Pat Breslin as Karen Lewis
- John Lupton as Peter Nichols
- Rita Lynn as Myra Heston
- Dabbs Greer as Charles Knudsen
- Whit Bissell as Max Pompey
- James Bell as Silas Vance
- Walter Coy as Gabe Rawson
- Nelson Leigh as Judge
- Betty Farrington as Woman
- George E. Stone as Court Clerk
- Charlotte Thompson as Matron
- #101: The Case of the Wandering Widow 10/22/60
- Paul Langton as Deputy D.A. Telford
- Coleen Gray as Lorraine Kendall
- Dean Harens as Morgan Riley
- Marguerite Chapman as Faye Donner
- Casey Adams as Burt Stokes
- Ralph Clanton as Roger McClaine
- Hugh Sanders as Warren Donner
- Robert Cornthwaite as Bill Worth
- Stephen Talbot as Jimmie Kendall
- Richard Gaines as Judge
- Robert Carson as Warden
- Robert Whiting as Mr. Leeman
- Gil Rogers as Buddy Staples
- Helen Spring as Martha
- #102: The Case of the Clumsy Clown 11/5/60
- Kenneth Tobey as Deputy D.A. Alvin
- Chana Eden as Lisa Franklin
- Douglas Henderson as Felix Heidemann
- Maggie Hayes as Joyce Gilbert
- Walter Sande as Judd Curtis
- Willard Sage as Tony Gilbert
- Robert Clarke as Jerry Franklin
- Ken Curtis as Tim Durant
- Lillian Bronson as Judge
- Jon Lormer as Autopsy Surgeon
- Russ Thompson as Ring Master
- #103: The Case of the Provocative Protege 11/12/60
- Virginia Field as Anita Carpenter
- Robert Lowery as Andrew Collis
- Kathie Browne as Donna Loring
- Robert Karnes as Deputy D.A. Chamberlin
- Charles D. Cooper as Eric Sturgis
- Gregory Morton as David Carpenter
- Harry Jackson as George Worthington
- Donald Foster as James Gracie
- Barry Cahill as Sgt. Binns
- Morris Ankrum as Judge
- Jon Lormer as Autopsy Surgeon
- George E. Stone as Court Clerk
- Cindy Courtland as Alice
- #104: The Case of the Nine Dolls 11/19/60
- Maggie Mahoney as Linda Osborne
- Jeanette Nolan as Emma Benson
- Laurie Perreau as Peggy Smith
- Frances Helm as Helene Osborne
- John Bryant as Larry Osborne
- Gage Clarke as Edgar Benson
- Francis X. Bushman as Courtney Jeffers
- John Banner as A. Tobler
- Robert Karnes as Deputy D.A. Chamberlin
- Nelson Leigh as Judge
- Eleanor Audley as Headmistress Lorimer
- Fred Essler as Mr. Kringle
- James Chandler as Sgt. Willoughby
- Eugene Borden as Swiss Waiter
- #105: The Case of the Loquacious Liar 12/3/60
- H. M. Wynant as Deputy D.A. Sampson
- Bruce Gordon as Judson Bailey
- Lurene Tuttle as Emma Bailey
- Wynn Pearce as Lester Martin
- Regis Toomey as Sam Crane
- Melora Conway as Lois Rogers
- Jeanne Baird as Marge Fuller
- Baynes Barron as The Man
- S. John Launer as Judge
- Dorothy Adams as Wilma Stone
- Michael Fox as Autopsy Surgeon
- John Truax as The Stranger
- Lori Kaye as Photo Girl
- George E. Stone as Court Clerk
- #106: The Case of the Red Riding Boots 12/10/60
- Corey Allen as Rennie Foster
- H. M. Wynant as Deputy D.A. Sampson
- Frank Maxwell as Joe Dixon
- Elen Willard as Ann Farwell
- Linda Leighton as Jill Farwell
- John Archer as Burt Farwell
- Shirley Ballard as Rita Conover
- Willis B. Bouchey as Judge
- Richard Deacon as Wilmer Beaslee
- Sara Seegar as Miss Pennock
- Reba Waters as Kathy Jergens
- Bill Idelson as Autopsy Surgeon
- George E. Stone as Court Clerk
- Michael Harris as Deputy Sheriff
- #107: The Case of the Larcenous Lady 12/17/60
- Ellen Drew as Julia Webberly
- Arthur Franz as Mayor Henderson
- Louise Fletcher as Susan Connolly
- Robert Brown as Frank Sykes
- Patricia Huston as Mona Henderson
- Edward Platt as Tom Stratton
- King Calder as William Carter
- Byron Morrow as Judge
- William Boyett as Sergeant Reynolds
- Myron Natwick as Desk Clerk
- Christopher Dark as Prosecutor Thorne
- Mara Massey as Switchboard Girl
- Robert Terry as Arnold Webberly
- #108: The Case of the Envious Editor 1/7/61
- Phillip Abbott as Edmond Aitken
- James H. Coburn as Donald Fletcher
- Paul Lambert as Ben Nicholson
- H. M. Wynant as Deputy D.A. Sampson
- Barbara Lawrence as Lori Stoner
- Jennifer Howard as Milly Nash
- Vinton Hayworth as Wendell Harding
- Sara Shane as Alyce Aitken
- S. John Launer as Judge
- Sid Tomack as Rudi Tripp
- Dave Willock as Jay Robinson
- Jim Drum as 1st Reporter
- Virginia Carroll as Mrs. Welch
- Paul Power as Winslow
- Donna Hayes as Girl
- Harry Hollins as 2nd Reporter
- George E. Stone as Court Clerk
- #109: The Case of the Resolute Reformer 1/14/61
- Richard Eastham as Deputy D.A. Parness
- Diana Millay as Debra Bradford
- John Hoyt as William Harper Caine
- Douglas Dick as Peter Caine
- James Westerfield as Roger Quigley
- Phillip Terry as Lawrence Kent
- Byron Palmer as Charles Sistrom
- Maxine Stuart as Grace Witt
- John McLiam as Councilman William Daniels
- Hardie Albright as Supervisor Albert Johnson
- Tom Harkness as Judge
- Charles J. Conrad as Dr. Auerback
- Tony Hughes as Jack Parrish
- Dennis Quinn as Lewis Bergdorf
- Bert Stevens as Ronald Arthur
- Dean Casey as Henry Bartlett
- Joe McGuinn as Lt. Lew Kaufman
- Gisele Verlaine as Waitress
- #110: The Case of the Fickle Fortune 1/21/61
- Cathy O'Donnell as Norma Brooks
- Vaughn Taylor as Ralph Duncan
- Philip Ober as Albert Keller
- Robert Casper as Charley Nickels
- Liam Sullivan as Lloyd Farrell
- Helen Brown as Mrs. Hollister
- Virginia Christine as Helen Duncan
- Richard Gaines as Judge
- Eve March as Nurse Hamilton
- Connie Cezon as Gertie
- Michael Fox as Autopsy Surgeon
- Berkeley Harris as Patrolman
- Lee Miller as Sgt. Brice
- George E. Stone as Court Clerk
- Hal Taggart as Clerk
- Vincent Troy as Waiter
- #111: The Case of the Waylaid Wolf 2/4/61
- Robert Karnes as Deputy D.A. Chamberlin
- Rebecca Welles as Edith Bristol
- Andra Martin as Arlene Ferris
- Laurie Mitchell as Madge Elwood
- Tony Travis as Loring Lamont
- Barry Atwater as George Albert
- Benson Fong as Colong Kim
- Robert Carricart as Orvel Kingman
- Frances Fong as Frances Kim
- I. Stanford Jolley as Jerome Henley
- Morris Ankrum as Judge
- Bill Cord as Police Officer Lyons
- Irvin Ashkenazy as Tom Grimes
- Elizabeth Harrower as Woman Apt. Manager
- Tiger Joe Marsh as Al
- Pitt Herbert as Coroner's Physician
- Lee Miller as Sgt. Brice
- George E. Stone as Court Clerk
- #112: The Case of the Wintry Wife 2/18/61
- Jerome Thor as Walter Randall
- Robert Karnes as Deputy D.A. Chamberlin
- June Vincent as Laura Randall
- Alan Hewitt as Bruce Sheridan
- Marianne Stewart as Phyllis Hudson
- Fredd Wayne as Roger Phillips
- Jean Howell as Amelia Phillips
- Barney Phillips as Mr. Johnson
- Sue England as Judy Baldwin
- Willis B. Bouchey as Judge
- Paul Barselow as John Penner
- Michael Fox as Autopsy Surgeon
- Robert Bice as Second Operative
- George E. Stone as Court Clerk
- Rudolph Salinger as Chemist
- Chuck Stroud as First Operative
- #113: The Case of the Angry Dead Man 2/25/61
- Gloria Talbott as Eve Nesbitt
- Edward Binns as Lloyd Castle
- Les Tremayne as Willard Nesbitt
- Gordon Jones as Second Deputy
- Carol Ohmart as Jenny Bartlett
- James Millhollin as Ben Otis
- Frank Ferguson as Prof. Laiken
- Naomi Stevens as Fanny Werbler
- Karl Held as Bruce Nesbitt
- Wally Brown as John Givney
- Ray Montgomery as First Deputy
- Juney Ellis as Receptionist
- Kenneth R. MacDonald as Judge
- Phil Chambers as Anderson
- Charles Stroud as Court Clerk
- #114: The Case of the Blind Man's Bluff 3/11/61
- John Conte as Karl Addison
- George Macready as Charles Slade
- Jean Allison as Helen Slade
- Jack Ging as James Kincannon
- Berry Kroeger as Edgar Whitehead
- Merry Anders as Adele Bentley
- Nelson Leigh as Judge
- Benny Rubin as Sassano
- Alexander Lockwood as Doctor
- Arthur Hanson as Sgt. Ferris
- Geraldine Wall as Mrs. Cartwright
- Sid Clute as Jack Shaw
- Bart Conrad as Charlie
- Susan Davis as Miss Padway
- George E. Stone as Court Clerk
- #115: The Case of the Barefaced Witness 3/18/61
- Paul Fix as Prosecutor Hale
- Josephine Hutchinson as Miss Sarah
- Malcolm Atterbury as Alfred Needham
- Roy Roberts as W. L. Picard
- Adam West as Dan Southern
- Enid Janes as Iris McKay
- Russ Conway as Fred Swan
- Eloise Hardt as Marta Wiltern
- Lewis Martin as Judge
- Tom Fadden as Beller
- Charles Briggs as Policeman
- Russ Bender as Chief Hagerty
- Rosemary Day as Secretary
- #116: The Case of the Difficult Detour 3/25/61
- Jeff York as Pete Mallory
- Suzanne Lloyd as Sheila Benton
- Jason Evers as Stuart Benton
- Mort Mills as Sgt. Ben Landro
- Lee Farr as Chet Stark
- Joe di Reda as Phil Edwards
- Neil Hamilton as Ames
- Joan Camden as Miriam Ames
- Bert Freed as Edward Parker
- John Gallaudet as Reviewing Judge
- S. John Launer as Judge
- Mike Masters as Driver
- #117: The Case of the Cowardly Lion 4/8/61
- Carol Rossen as Hilde Fursten
- Fred Beir as Tony Osgood
- Phyllis Coates as Frieda Crawson
- Leslie Bradley as Dr. Walther Braun
- Warren Kemmerling as Boris Zelbowski
- O. Z. Whitehead as Harry Beacom
- Betty Lou Gerson as Trudie Braun
- Paul Birch as Sec. Officer Crawford
- Paul Langton as Prosecutor Green
- Eddie Quillan as Bookkeeper Keller
- Mack Williams as Second Judge
- Bill Quinn as First Judge
- Norman Leavitt as Crime Lab Technician
- Art Lewis as Immigration Clerk
- Ralph Manza as Dr. Prince
- Bert Remsen as Lt. White
- #118: The Case of the Torrid Tapestry 4/22/61
- Conrad Nagel as Nathan Claver
- Paula Raymond as Brenda Larkin
- Robert H. Harris as Claude Demay
- Lillian Buyeff as Sarah Demay
- John Holland as Leonard Voss
- Ray Kellogg as Jim Hazlett
- Kenneth R. MacDonald as Judge
- Percy Helton as Pawnbroker
- Syd Saylor as Watchman
- John Graham as Lawrence
- Lloyd Nelson as Clerk
- Louis Serrano as Officer
- #119: The Case of the Violent Vest 4/29/61
- Myrna Fahey as Grace Halley
- Hayden Rorke as Walter Caffrey
- Sonya Wilde as Joy Lebaron
- Erik Rhodes as Herman Albright
- Joe Cronin as Buddy Frye
- Dorothy Green as Ida Albright
- Rosemary Eliot as Vicky
- Frank Jenks as Barman
- Richard Gaines as Judge
- Barbara Pepper as Mrs. Diamond
- Bill Erwin as Superintendent
- Robert Harrow as Young Man
- Sam Flint as Welkes
- George E. Stone as Court Clerk
- #120: The Case of the Misguided Missile 5/6/61
- Bruce Bennett as Dan Morgan
- Jeanne Bal as Helen Rand
- Simon Oakland as Captain Caldwell
- Robert Rockwell as Major Jerry Reynolds
- Richard Arlen as Dr. Harrison
- William Schallert as Dr. Bradbury
- Med Flory as Captain McVey
- George Neise as George Huxley
- Stephen Roberts as Major Cooke
- Richard Shannon as Colonel Sloan
- Ronnie Knox as Sgt. Lewis
- Larry Gray as Brig. Gen. Bishop
- Clark Howat as Lt. Col. Fremont
- Alan Dexter as Dr. Stanton
- Paul Lees as Air Policeman
- James Sikking as Civilian Engineer
- #121: The Case of the Duplicate Daughter 5/20/61
- Don Dubbins as Hartley Elliott
- Anne Helm as Glamis Barlow
- Walter Kinsella as Carter Gilman
- Kaye Elhardt as Muriell Gilman
- Joyce MacKenzie as Nancy Gilman
- Willis Bouchey as Judge
- Dick Whittinghill as Glenn McCoy
- Harlan Warde as Connors
- Nelson Olmsted as Cartman Jasper
- Michael Fox as Autopsy Surgeon
- Don Harvey as Sheriff
- George Selk as Maurice Fellows
- Charles Stroud as Court Clerk
- #122: The Case of the Grumbling Grandfather 5/27/61
- Patricia Barry as Dorine Hopkins
- Otto Kruger as J. J. Gideon
- Karl Held as David Gideon
- Frances Rafferty as Sue Franks
- Gavin Mac Leod as Lawrence Comminger
- Phil Arthur as Si Farrell
- Fifi D'Orsay as Woman Witness
- Dub Taylor as Stroller
- John Gallaudet as Superior Court Judge
- Kenneth MacDonald as Trial Judge
- Henry Hunter as Avery Bellison
- John Close as Police Sergeant
- Maura McGiveney as Waitress
- Fred Coby as Tony Mongomery
- Hal Dawson as Watchman
- Lee Miller as Sgt. Brice
- #123: The Case of the Guilty Clients 6/10/61
- Lisa Gaye as Lola Bronson
- Charles Bateman as Jeff Bronson
- Guy Mitchell as Bill Ryder
- Faith Domergue as Conception O'Higgins
- Barbara Stuart as Violet Ryder
- Alan Bunce as Courtney Patton
- William Mims as Leander Walker
- Ben Wright as Clarence Keller
- Grandon Rhodes as Divorce Judge
- Sydney Smith as Trial Judge
- Tom Vize as Astronomer
- Pitt Herbert as Pathologist
- Charles Stroud as Court Clerk
- Lee Miller as Sgt. Brice
- William Coffin as Pilot