Narrator / Host / Self - Host (78 episodes, 1955-1957)
Dr. Franklin / Dr. Gordine / Dr. James Kincaid / Dr. Maxwell / Dr. Norstad / Dr. Paul Edwards / Man Heard on Speaker / Radar Man (7 episodes, 1955-1956)
Dr. Albert Neville / Dr. David J. Masters / Dr. Tom MacDougal / Gil Collins / James Tyler / Jim Connors / Prof. Nat Kendall (7 episodes, 1955-1956)
Dr. Dan Scott / Dr. Edgar Barnes / Dr. Henry Maxton / Dr. Jim Wallaby / Dr. Warren Stark / Prof. Norman Hughes (6 episodes, 1955-1957)
Dean Howard Menges / Dr. Cole / Dr. H.J. Lawton / Dr. John Crane / Prof. Tubor / Rudyard Parker (6 episodes, 1955-1957)
Amy Kern / Edna Miner / Eileen Scott / Jane Morris / Kate Donaldson / Reggie Gress (6 episodes, 1955-1957)
Agent John Randall / Bill North / Dr. Norman Turner / Mystery Scientist on Radio / Robert Thornton / Shaw (5 episodes, 1955-1957)
Bill Twining / Dr. Alan Cathcart / Dr. Arnold Bryan / Dr. John Barlow / Prof. Paul Cameron (5 episodes, 1955-1957)
Dr. Hugh Bentley / Dr. Sheldon Thorpe / Gen. Troy / General Frank Terrance / Major Sorenson (5 episodes, 1955-1957)
Dr. Jeff Conover / Fred Strand / George Bascomb / Jeff Jamison / Mark Kendler (5 episodes, 1955-1956)
Fluoroscope Man / TV Reporter at Hospital / Tom / Truman Bradley's Lab Assistant / Western Union Messenger (1 episode, 1955-1957)
Dr. Don Stewart / Dr. Samuel Willard / Dr. Vincent Milhurst / Jim Wells (4 episodes, 1956)
Dr. Fred Garner / Dr. Roger Kiley / Hugh Warner / Roger Brown (4 episodes, 1955-1956)
Ada March / Cathy Parker / Laura Gilmore / Nan Guild (4 episodes, 1955-1956)
Alma Ford / Anna Brown / Cynthia Blake / Helen Tuttle (4 episodes, 1955-1957)
Dr. Kenneth White / Dr. Lewis Milton / Mr. Rohrbach / Thatcher (4 episodes, 1955-1957)
Campbell / Dr. Clausen / Dr. McDermott / George Halsey (4 episodes, 1955-1956)
Bill / Dr. Henry J. Upton / Dr. Wayne Masters / TV Announcer (4 episodes, 1955-1956)
Detective Sergeant / Mr. Evans / Sheriff / Sheriff Grayson (4 episodes, 1955-1956)
John Scott / Richard Owen / Stanley Barnes / Technician (4 episodes, 1956-1957)
Charles Irwin / Joe Crane / Lt. Ralston / Station 4 Officer (4 episodes, 1955-1956)
Johnson / Paul / Police Lt. Healy / Prof. Hammell (4 episodes, 1955-1956)
George / Joe Green / Skinner / Truck Driver (4 episodes, 1955-1957)
Alien / Dr. Sutton / Mr. Avitor / Radio Announcer (3 episodes, 1956)
Bill Reynolds / Bob Laurie / Lawrence Kerston (3 episodes, 1955-1956)
Dr. Susan Calvin / Linda Otis / Marion Brown (3 episodes, 1955-1956)
Dr. George Stoneham / Dr. Robert Porter / Walter Daniels (3 episodes, 1955-1956)
Dr. Milton Otis / Dr. Paul Sinclair / Prof. Hugh Fredericks (3 episodes, 1955-1956)
Dr. Keith Brandon / Ralph Parr / Ramon Sanchez (3 episodes, 1955-1956)
Dr. Maxwell Carnaven / Fred Lopert / Harry Grayson (3 episodes, 1956)
Al Mitchell / Daniel Blake / Police Lt. Jules Moss (3 episodes, 1956)
Joan Crane / Maggie Dawes / Marie Adler (3 episodes, 1955-1957)
Dr. Brewster / Phil Coulson / Police Inspector Mark Davis (3 episodes, 1955-1956)
Carl Eberhardt / Dr. Jim Harris / Steve Morris (3 episodes, 1955-1956)
Comdr. Stanley / David Vollard / Dean Trimble (3 episodes, 1955-1956)
Dr. Johnston / Everett Sturgis / Gen. Jacob Evans (3 episodes, 1955-1956)
Dr. Lawrence--Gray-Haired Scientist / George Martin / Patrolman Tom Horton (3 episodes, 1956)
Carter B. Page / Jonathan Vollard / Prof. Rudman (3 episodes, 1956)
Col. Stewart / John Barton / Neilson (3 episodes, 1955-1956)
Dr. Haley / Dr. Hargrove / Dr. MacKenzie (3 episodes, 1956)
Dr. Porter Owen / Edmund Reis / George Warren (3 episodes, 1955-1956)
Bobby Avitor / Donald Barton / Terry Scott (3 episodes, 1956-1957)
Captain Hall, M.D. / Dr. Milo Barton / Matt Brander (3 episodes, 1955-1956)
Arthur Kern / MacNamara / Prof. Horst Reimers (3 episodes, 1955-1956)
Dr. Raymond Michaels / Pete Lane / Sheriff Gomez (3 episodes, 1955-1956)
Girls' Dorm Supervisor / Millie / Mrs. Shea (3 episodes, 1955-1957)
Frank / Lab Technician / Scientist (3 episodes, 1956-1957)
Dr. Hunter / Edward Stevens / Mr. Adams (3 episodes, 1956-1957)
Bernice Knight / Janice O'Hara (2 episodes, 1955-1956)
Capt. John Forester / Joe Ferguson (2 episodes, 1955)
Dr. Erwin Bach / Dr. Richard Marshall (2 episodes, 1955)
Dr. Ken Donaldson / Vic Murphy (2 episodes, 1955)
Dr. Emanuel M. Hall / Dr. Werner Engstrom (2 episodes, 1955)
Dr. Myrna Griffin / Jean Gordon (2 episodes, 1955)
Dr. Lorenz / Dr. Pliny (2 episodes, 1955)
Dr. Philip Redmond / Police Sgt. Gary Williams (2 episodes, 1956)
Dr. Elwood Dove / Dr. Richard Hewitt (2 episodes, 1956)
Nancy Stanton / Pat Hastings (2 episodes, 1955)
Dr. Paul Novak / John Emerson (2 episodes, 1955)
Police Lt. Mike Redding / Prof. Arthur Gress (2 episodes, 1955-1956)
Dr. Richard Wissman / Mr. Rogers (2 episodes, 1955-1956)
Celia Jamison / Dr. Janice Morgan (2 episodes, 1955)
Dr. Robert Barton / Lt. David Cramer (2 episodes, 1955)
Elaine Conover / Jane Brandon (2 episodes, 1956)
Barbara Arnold / Elizabeth Wickes (2 episodes, 1955-1957)
Katherine Kerston / Sally Torens (2 episodes, 1955-1956)
Dr. Paul Kincaid / Jeff Spencer (2 episodes, 1955-1956)
Prof. Richard Sheldon / Ted Heller (2 episodes, 1955)
Detective Sgt. Cox / Dr. Donaldson, Sr. (2 episodes, 1955)
Dr. Eleanor Ballard / Prof. Anna Adler (2 episodes, 1956)
Frank Davis / Lieutenant Dunne (2 episodes, 1955-1956)
Alma Stark / Joan Emerson (2 episodes, 1955-1956)
Ballard / Dr. August Wykoff (2 episodes, 1955-1956)
Diane Turner / Helen Gunderman (2 episodes, 1955)
Ellen Barton / Peggy Kendler (2 episodes, 1956)
Nina Keller / Wilma Mathews (2 episodes, 1955-1956)
Ed Gorman / Everett (2 episodes, 1955-1956)
Ralph Scott / Walter Bronson (2 episodes, 1955-1956)
Gene Willard / Jeff Jamison Jr. (2 episodes, 1955-1956)
Police Capt. Damon / Prof. Norman Stern (2 episodes, 1955)
Dr. Lindstrom / Everett Prescott (2 episodes, 1956)
Dr. Steve Dorian / Olson (2 episodes, 1956)
Col. Eugene Beckwith / Colonel Davis (2 episodes, 1955-1956)
Charles S. Lyons / Det. Lt. Crenshaw (2 episodes, 1955-1956)
Galleon / Mendoza (2 episodes, 1955-1956)
Dick Ganz / Hotel Desk Security (2 episodes, 1955-1956)
Dr. Avery / Murray Lewis (2 episodes, 1955)
Dr. Hugo Milton / Dr. Morton Archer (2 episodes, 1955)
Dean Collins / Jim Dale (2 episodes, 1956)
Dr. Herbert / Dr. Schiller (2 episodes, 1956)
Doug Hinkle / Ralph Marken (2 episodes, 1956)
James Russell / Mr. Miller (2 episodes, 1955-1957)
Frank Jenkins / Sheriff Alderson (2 episodes, 1955)
Capt. Landry / Dr. Stone (2 episodes, 1956)
Mrs. Horton / Nurse Tait (2 episodes, 1956)
Chet Arnold / Schmidt (2 episodes, 1955-1956)
Professor Adams / Ray Cordell (2 episodes, 1956)
Dr. Bane / Roger Polson (2 episodes, 1956)
Kenny Guild / Sammy Gilmore (2 episodes, 1955)
Joyce McLane / Judy Rogers (2 episodes, 1956)
Lieutenant / Warrant Officer Milligan (2 episodes, 1955)
Adam / Naval Officer (2 episodes, 1956)
Alice Kinder / Blonde Nurse (2 episodes, 1955-1956)
Bailiff / Harry (2 episodes, 1955-1956)
Dr. Harold Lewis / Mike (2 episodes, 1956)
Dr. Frederick Ryner / Kenneth Clayton (2 episodes, 1956)
Capt. Landry's Assistant / Radioman (2 episodes, 1956)
Dr. Albert Finch / Mr. Malloy (2 episodes, 1955)
Ann Brander / Seja Dih's Granddaughter (2 episodes, 1955)
Brunette Nurse / Nurse Williams (2 episodes, 1955)
Elton Crane / Joe Ellison (2 episodes, 1955-1956)
Duncan / Frank (2 episodes, 1955-1956)
Bishop / Capt. Bob Stanton (2 episodes, 1956)
Joe (2 episodes, 1956-1957)
Dr. Victor Berenson (1 episode, 1955)
Sam Gilmore (1 episode, 1955)
Norman Conway (1 episode, 1955)
Professor Alex Bondar (1 episode, 1955)
Dr. Walter Arnold (1 episode, 1955)
Dr. Lee Seward (1 episode, 1955)
Capt. John Perry (1 episode, 1955)
Al Brown (1 episode, 1955)
Mel Wingate (1 episode, 1955)
Maj. Fred Gunderman (1 episode, 1955)
Dr. Osbourne (1 episode, 1955)
Dr. Elliott Harcourt (1 episode, 1955)
Edward Burton (1 episode, 1955)
Eve Patrick (1 episode, 1956)
Capt. Steve Conway (1 episode, 1956)
Dr. Tom Mathews (1 episode, 1956)
Det. Lt. William Kiel (1 episode, 1956)
Dr. John Hustead (1 episode, 1957)
Grandpa Scott (1 episode, 1957)
Nell Brown (1 episode, 1955)
Mr. Thomas (1 episode, 1955)
Seth Turner (1 episode, 1955)
Sheila Dunlap (1 episode, 1955)
Verda Wingate (1 episode, 1955)
Dr. Guy Stanton (1 episode, 1955)
Bud Porter (1 episode, 1955)
Ellie Ferguson (1 episode, 1955)
John Bowers (1 episode, 1955)
Jean Forester (1 episode, 1955)
Julie Bondar (1 episode, 1955)
Timmy Daniels (1 episode, 1955)
Prof. Samuel Avery (1 episode, 1955)
Kyra Zelas (1 episode, 1955)
Warren Keath (1 episode, 1955)
Dr. Jeffries (1 episode, 1955)
Ed Tratnor (1 episode, 1955)
Britt (1 episode, 1956)
Prof. Carl Schneider (1 episode, 1956)
Prof. Van Doorne--Scientist with Glasses (1 episode, 1956)
Howard Evans (1 episode, 1956)
Joe Castle Jr. (1 episode, 1956)
Jean Rudman (1 episode, 1956)
Nina Barlow (1 episode, 1956)
Grace Laurie (1 episode, 1956)
Barbara Cameron (1 episode, 1957)
Dr. Jan Corey (1 episode, 1955)
Karen Sheldon (1 episode, 1955)
Pete (1 episode, 1955)
Virginia Kincaid (1 episode, 1955)
Dr. David Brooks (1 episode, 1955)
Lois Strand (1 episode, 1955)
Dr. Robinson (1 episode, 1955)
Julie Tyler (1 episode, 1955)
Ed Garrett (1 episode, 1955)
Dr. James Everett (1 episode, 1955)
Evelyn Raleigh (1 episode, 1955)
Prof. Buck Weaver (1 episode, 1955)
Lt. Col. Van Dyke (1 episode, 1955)
Mrs. Peterson (1 episode, 1955)
Henry Stark (1 episode, 1955)
Dr. Clements (1 episode, 1955)
Police Commandante (1 episode, 1955)
Gen. Kenyon (1 episode, 1955)
Nina Lasalle (1 episode, 1956)
Dr. Stockton (1 episode, 1956)
Prof. Bernini (1 episode, 1956)
Jean Richardson (1 episode, 1956)
Barbara Davis (1 episode, 1956)
Ruth Taney (1 episode, 1956)
Sheriff Barney Cole (1 episode, 1956)
Padre Xavier (1 episode, 1956)
Ed Martin (1 episode, 1956)
Prof. Van Kamp (1 episode, 1956)
Jill Page (1 episode, 1956)
Dr. Mark Cook (1 episode, 1956)
Karl Krauss (1 episode, 1956)
Dr. Robert Werth (1 episode, 1956)
Rosellen Avitor (1 episode, 1956)
Clyde Bishop (1 episode, 1957)
Dr. Franklin (1 episode, 1957)
Dr. Smiley (1 episode, 1955)
Dr. Norman Heller (1 episode, 1955)
Lt. Frank Buchanan (1 episode, 1955)
Frank (1 episode, 1955)
Dr. Hoster (1 episode, 1955)
Hannah (1 episode, 1955)
Mr. Lyman (1 episode, 1955)
Paula Kennedy (1 episode, 1955)
Bobby Tyler (1 episode, 1955)
Dr. Briggs (1 episode, 1955)
Superintendent (1 episode, 1955)
Governor (1 episode, 1955)
Ann Heller (1 episode, 1955)
Charlie (1 episode, 1955)
Dr. Lee Suyin (1 episode, 1955)
Terry Jamison (1 episode, 1955)
Police Officer (1 episode, 1955)
Tommy Parker (1 episode, 1956)
Coach Shane (1 episode, 1956)
Joseph Castle Sr. (1 episode, 1956)
Wanda (1 episode, 1956)
Tommy Cooper (1 episode, 1956)
Tawa (1 episode, 1956)
Ward Baxter (1 episode, 1956)
Dr. Lloyd (1 episode, 1956)
Dr. John Bellow (1 episode, 1956)
Larry Evans (1 episode, 1956)
Dr. Robert March (1 episode, 1956)
Alma Willard (1 episode, 1956)
Dr. Selwyn Frake (1 episode, 1956)
Dr. Brady (1 episode, 1956)
Dr. Jim Woodward (1 episode, 1956)
Elaine (1 episode, 1956)
Hospital Doctor (1 episode, 1956)
Gen. Dothan (1 episode, 1957)
Bud (1 episode, 1957)
Ken Waring (1 episode, 1957)
Mr. McAdoo (1 episode, 1955)
Dr. McLeod (1 episode, 1955)
Sheriff Carson (1 episode, 1955)
Sheriff Edgar Simpson (1 episode, 1955)
Mrs. Canby (1 episode, 1955)
Prof. Samuel Carson (1 episode, 1955)
Lt. Carruthers (1 episode, 1955)
Deputy Charlie (1 episode, 1955)
Dr. Heineman (1 episode, 1955)
Barbara Daman (1 episode, 1955)
Sgt. Cornelius Cooper (1 episode, 1955)
Prof. Spaulding (1 episode, 1955)
Dr. Ahmed Abdullah (1 episode, 1955)
Mort Woods (1 episode, 1956)
Willis (1 episode, 1956)
Dr. Charles Hayes (1 episode, 1956)
Ned (1 episode, 1956)
Susan Avitor (1 episode, 1956)
Hotel Manager (1 episode, 1956)
File Clerk (1 episode, 1956)
Hotel Maid (1 episode, 1956)
Neville's Mother (1 episode, 1956)
Sam Gilman (1 episode, 1956)
Pandit Chandra Singh (1 episode, 1956)
Martha Hewitt (1 episode, 1956)
Selma Sanford (1 episode, 1956)
Deputy Terry (1 episode, 1957)
Mrs. Garby (1 episode, 1957)
Col. R.J. Barton (1 episode, 1955)
Dr. Lee Thomas (1 episode, 1955)
Robbery Victim (1 episode, 1955)
Silas Barker (1 episode, 1955)
Girl (1 episode, 1955)
Dr. Millard Townsend (1 episode, 1955)
Houseboy (1 episode, 1955)
Nurse (1 episode, 1955)
Mrs. LeBlanc (1 episode, 1955)
Ruth (1 episode, 1955)
Joe (1 episode, 1955)
TV Announcer (1 episode, 1955)
Dr. Hemingway (1 episode, 1955)
Fleming (1 episode, 1955)
Alice Cooper (1 episode, 1956)
Sean Daley (1 episode, 1956)
Dr. Richard Patterson (1 episode, 1956)
Bill (1 episode, 1956)
Pat Johnson (1 episode, 1956)
Dr. Joel Kerwin (1 episode, 1956)
Jimmy Stark (1 episode, 1956)
Elinor Lopert (1 episode, 1956)
Ruth (1 episode, 1956)
Henry Mason (1 episode, 1956)
TV Announcer (1 episode, 1956)
Gen. Walter Rayburn (1 episode, 1956)
Old Man (1 episode, 1956)
Air Controller (1 episode, 1956)
Dr. Phil Avery (1 episode, 1956)
Waiter (1 episode, 1956)
Don Cater (1 episode, 1956)
Denby (1 episode, 1957)
Dr. Jorgenson (1 episode, 1957)
Student (1 episode, 1955)
Laurie Kern (1 episode, 1955)
Capt. Boyce (1 episode, 1955)
Eileen Herrick (1 episode, 1955)
Dr. Miller (1 episode, 1955)
Doctor (1 episode, 1955)
Robb (1 episode, 1955)
Desk Nurse (1 episode, 1956)
Ann Page (1 episode, 1956)
Alice (1 episode, 1956)
Nurse Sloan (1 episode, 1956)
Young Man (1 episode, 1956)
Dr. John Bergstrom (1 episode, 1956)
Nurse (1 episode, 1956)
Mary Kerwin (1 episode, 1956)
Jennings (1 episode, 1956)
Chaney (1 episode, 1956)
Worker (1 episode, 1956)
Assassin (1 episode, 1956)
Nora Lester (1 episode, 1956)
Ed Clayborn (1 episode, 1956)
Al Hall (1 episode, 1956)
FCC Agent Brummer (1 episode, 1957)
Mr. Jackson (1 episode, 1957)
Mme. DeCosa (1 episode, 1957)
Dr. Charles Conselman (1 episode, 1955)
Howie Stevens (1 episode, 1955)
Capt. Ferguson (1 episode, 1955)
Sergeant (1 episode, 1955)
Anesthetist (1 episode, 1955)
Sonar Operator (1 episode, 1955)
Cleaning Lady (1 episode, 1955)
Dr. Markell (1 episode, 1955)
Thelma Marlow (1 episode, 1955)
Maid (1 episode, 1955)
Cleaning Woman (1 episode, 1955)
British Institute Receptionist (1 episode, 1955)
Mr. Stevenson (1 episode, 1956)
Desk Clerk (1 episode, 1956)
Judy (1 episode, 1956)
Fielding (1 episode, 1956)
Dr. Leonard Mills (1 episode, 1956)
Chorus Girl (1 episode, 1956)
Bob Wilson -- Code Unscrambler (1 episode, 1957)
Witness (1 episode, 1955)
Radio Operator (1 episode, 1955)
(1 episode, 1955)
Switchboard Operator (1 episode, 1955)
Sylvia Weiss (1 episode, 1955)
Radio Operator (1 episode, 1956)
Electronics Expert (1 episode, 1956)
Mr. Wilkins (1 episode, 1956)
Henry Richards (1 episode, 1956)
Dr. Benton (1 episode, 1956)
Hotel Receptionist (1 episode, 1956)
Sloan (1 episode, 1956)
Carr (1 episode, 1956)
Boy Finding Dog (1 episode, 1956)
Agent Ross (1 episode, 1957)
Scientist (1 episode, 1956)
Secretary (1 episode, 1956)
Malcolm Douglas (1 episode, 1955)
Telephone Operator (1 episode, 1956)
Unidentified Role (1 episode, 1956)
Willard Hicks (1 episode, 1955)
Guard #1 (1 episode, 1956)
Self (1 episode, 1955)
Bit / Lab Assistant (uncredited) (3 episodes, 1956-1957)
Nurse / Woman (uncredited) (2 episodes, 1955-1956)
Man at Lunch Stand / Police Officer (uncredited) (2 episodes, 1955-1956)
Bit / Man at Lunch Stand (uncredited) (2 episodes, 1955-1956)
Janitor (uncredited) (1 episode, 1955)
FBI Man (uncredited) (1 episode, 1955)
Dr. Kennedy (uncredited) (1 episode, 1955)
Lester (uncredited) (1 episode, 1955)
Milkman (uncredited) (1 episode, 1955)
Teletype Secretary (uncredited) (1 episode, 1955)
Henry (uncredited) (1 episode, 1955)
Maintenance Man (uncredited) (1 episode, 1955)
Uniformed Policeman (uncredited) (1 episode, 1955)
Assistant in Truman Bradley Intro (uncredited) (1 episode, 1956)
Pedestrian (uncredited) (1 episode, 1956)
Ralph (uncredited) (1 episode, 1956)
Undetermined Role (uncredited) (1 episode, 1956)
Bit (uncredited) (1 episode, 1956)
Gas Pumper / Mechanic (uncredited) (1 episode, 1956)
Security Guard (uncredited) (1 episode, 1956)
Photographer (uncredited) (1 episode, 1956)
Man (uncredited) (1 episode, 1956)
Lab Assistant (uncredited) (1 episode, 1957)