- Russell Johnson - Asst D.A. Grant
- Russell Johnson - Brenton Grant
- Russell Johnson - Asst. D.A. Grant
- Russell Johnson - Asst. D.A. Brenton Grant
- Farrah Fawcett - Tori Barbour
- Farrah Fawcett - Susie
- Gary Grimes - Howie Bowers
- Norman Alden - Henry Grover
- Don 'Red' Barry - Jenkins
- Harry Harvey - George Cheevers
- Don Eitner - Ted Watkins
- John Lupton - George Cardwell
- Robert Hogan - Clayton Short
- Robert Hogan - Officer Pete McKay
- Anson Williams - Steve Baggot
- Stephen Young - Dave Butler
- Carmen Zapata - Mrs. Chavez
- Val Bisoglio - Dr. Pelleterri
- David Soul - Ted Warrick
- David Soul - Doug
- David Soul - Pete
- Don Brodie - Blakely
- Richard Eastham - Prof. Gannett
- Darren McGavin - McClain
- Ricky Nelson - Vic
- Randolph Mantooth - Keith Ryder
- Larry Pennell - Sgt. Bill Carrington
- Edward Platt - Caldwell
- Eve Arden - Dr. Lucille Barras
- Don Diamond - Clerk
- Victor Izay - Howard
- Christopher George - Cromwell
- Heather Menzies - Sally Waite
- Jane Wyatt - Margaret Wilson
- Robert Young - Dr. Marcus Welby
- James Brolin - Dr. Steven Kiley
- Elena Verdugo - Consuelo Lopez
- Lynda Day George - Leigh Conforti
- Pamela Hensley - Miss Lathom
- Jane Wyman - Sophia Ryder
- Macdonald Carey - Earl Ryder
- Henry Jones - Dr. Metz
- Bill Zuckert - Chief Evans
- Bill Zuckert - Sam Barrett
- Dennis Patrick - Judge
- Charles H. Gray - Colonel Madison
- Bill Quinn - Judge
- Bill Quinn - Judge Tomlinson
- Fritz Weaver - Dr. Martin Cohen
- Joel Fabiani - Donald Parish
- Steve Franken - Kurt Balks
- Arlene Golonka - Gloria Green
- Jean Allison - Mrs. Stewart
- Jean Allison - Martha Collier
- Joseph V. Perry - John Newton
- Pernell Roberts - Ralph Foster
- Morgan Jones - Det. Sgt. Brady
- Morgan Jones - Detective
- Anne Seymour - Dowager
- Florida Friebus - Miss Walsh
- John Francis - Clerk
- John Francis - Court Clerk
- Arthur Franz - Caroll Shaw
- Arthur Franz - Laird Holden
- Kip Niven - Fred Holden
- Liam Dunn - Mr. Brighton
- Barry Sullivan - Grant Chase
- John Larch - George Patterson
- Ed Begley Jr. - Howard Dubberly
- Edward Andrews - H.T. Finneran
- Walter Brooke - Mr. Patrick
- Walter Brooke - Dr. Yates
- Rory Calhoun - Bwana Bill
- Linden Chiles - Drew Shields
- Kent Smith - Keats
- Diana Muldaur - Gloria Shields
- Diana Muldaur - Janet
- Kathryn Givney - Rhoda Dabney
- Diana Douglas - Mrs. Laken
- Kaz Garas - Brad Warner
- Bob Harks - Bailiff (uncredited)
- Bob Harks - Courtroom Spectator (uncredited)
- Bob Harks - Jury Foreman (uncredited)
- Kristoffer Tabori - Will Laken
- Kenneth Tobey - Tony Alexander
- Louis Gossett Jr. - Lt. Carl Fellows
- Gabriel Dell - Matt Hanks
- Lynne Marta - Jennie Davis
- Barbara Rush - Louise Carpenter
- Christine Belford - Jeanine Michaels
- Christine Belford - Karen Slater
- Craig Stevens - Julian Carpenter
- O.J. Simpson - Simms
- William Smithers - Mark Wade
- Dabney Coleman - Frank Wellmam
- Tim Matheson - Zooie Palmer
- Tim Matheson - Gerry Collier
- Tim Matheson - John Peterson
- Dana Elcar - Paul Henderson
- Neva Patterson - Helen Flint
- Jordan Rhodes - Harris
- Richard Anderson - Fred Palmer
- Jack Ging - Police Sgt. Gurney
- Jackie Coogan - Zigler
- George Murdock - Lt. Matheson
- Edith Atwater - Eleanor Hamilton
- Paul Fix - Dr. Mel Woodruff
- DeForest Kelley - Frank Slater
- Darrell Larson - Poco Lewis
- Ross Martin - Dr. Emery Lewis
- Robert Sampson - Stuart Barnes
- Peter Breck - Mike Palmer
- Aneta Corsaut - Ethel Palmer
- Robert Donner - Detective Coombs
- Belinda Montgomery - Susan
- Robert Emhardt - Jack Walthers
- Richard Bull - Mr. Harris
- Ron Masak - Stan Krause
- Vince Howard - Airport Mechanic
- Lou Antonio
- Harry Falk
Edward Platt hace el papel de Caldwell.
Eve Arden interpreta a Dr. Lucille Barras en la serie.
Ricky Nelson hace el papel de Vic.
Jane Wyatt interpreta a Margaret Wilson en la serie.
Lee Majors interpreta a Jess Brandon en la serie.
Arthur Hill interpreta a Owen Marshall en la serie.
Reni Santoni interpreta a Danny Paterno en la serie.
Pat Harrington, Jr. hace el papel de DA Charlie Gianetta.
Russell Johnson interpreta a Asst D.A. Grant en la serie.
Christine Matchett interpreta a Melissa Marshall en la serie.
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