The Professional Witness (archive footage)
Matt Drayton
C. G. Culpepper
Narrator (voice)
Dan Haywood
Father Matthew Doonan
Henry Drummond
Mayor Frank Skeffington
The Old Man
Richard Sumner
Zachary Teller
John J. Macreedy
Matt Devereaux
Clinton Jones
Capt. Christopher Jones
Mike Conovan
James P. Curtayne
Stanley Banks
Stanley T. Banks
Carnaghan
Adam Bonner
Arnold Boult
Pete Sandidge
Grant Matthews
Cass Timberlane
Col. James B. Brewton
Pat Jamieson
Lt. Col. Jimmy Doolittle
George Heisler
Stevie O'Malley
Pilon
Sam Craig
Dr. Henry 'Harry' Jekyll / Mr. Hyde
Edward Flanagan
Square John Sand
Thomas A. Edison
Man Admiring Portrait of Thomas A. Edison
Major Robert Rogers
Karl Decker
Henry M. Stanley
Self (uncredited)
Father Flanagan
Gunner Morse
John Hennessey
Joe Benton
Manuel Fidello
Fred P. Willis
Warren Haggerty
Father Tim Mullin
Joe Wilson
Dutch
Ross 'Mac' McBride aka Danny Ross Ackerman
Jim Carter
Steven 'Steve' Grey
Bill Shevlin
Dr. Crawbett
Murray Golden
'Smoothie' King
Joe Graham
J. Aubrey Piper
Edward Carson
Tom Garner
Pat Jackson
Joe Buck
Tommy Connors
Danny Dolan
Tom Brian
Briscoe
Jack Doray
Dick Fay
Wilkie
William Kelley
Bill
William Donroy
Daniel J. 'Bugs' Raymond
Saint Louis
Taxi Driver