John Bradford
District Attorney Adair
Lieutenant Tragg (271 episodes)
Eric Warren
Harris Clayton
Herbert Brenner (1 episode)
Alfred Metcalfe
Gen. Sam Woolery (1 episode)
Dr. Bailey
J.P. Miller (sometimes called J.B. Miller)
Judge Harper
Callicott (1 episode)
Judge Harper (1 episode)
Mica Ralston (rancher)
Sheriff Masters
Jerome Harris (1 episode)
Barton Keyes (1 episode)
Max (1 episode)
Mr. Tremaine
Insp. Appleby
Dan Reasonover
Daniel Webster (1 episode)
Fred F. Whacker
Gen. Birabeau
Storey
Jonathan Parker
Timothy Stone
Edmund Jethrow
Warren Pritchard
Judge Kenneth Turner
Mortimer Welsh
Judge Thomas Kneeland
Jonathan Parker
Rear Adm. L. C. Tennant
Arch Strobie
Jasper G. Wingait
Commodore Parker
Jonah Evans
Dr. Fredericks
Colonel Hooker
A B Blair
Jefferson Almond
Roger Enright
Alfred Greenleaf
Matthew 'Matt' Simpson
Thomas Vollmer
Arthur Burdett, alias Philip J. Fogarty
Maj. Desmond Lansing
Rev. Daniels
Harvey Elwood
Big Ed Carter
Lt. Col. Avery Silver
MacCoppin
Fred Houlihan
Victor Donlan
Dr. Matt Beemish
Perry Barton
Opening Narrator (voice) (uncredited)
Mr. Milton
Emil Blanchard
Gordon Stewart
Judge Watson
Dr. Lowell
Davis Banton
Colonel Farewell / Narrator
Leonides
Dr. Elijah Howe
Mr. Floyd Henderickson
Glen Robie
Phillip Treadway
John Chase Randall
Senator Frost
Johnny Adair
Wallau
Deckman West
Cardinal von Faulhaber
Otis Bird
Brodie S. Griffith
Lecturer (voice) (uncredited)
Grover Kendall
Col. John Mason
Dr. John Carey
Snodgrass
Mr. Macauley
Johan Bergesen
Capt. McCall
Ben Van Steel, Tommy's Uncle
Professor B
Jack Amberson
Jim W. Gettys
Mr. Lambert (uncredited)
Police Sergeant on Bicycle (uncredited)