Marshall Bradford

Judge Murdock

Doc Kemper

Dr. Matthias (uncredited)

District Attorney (uncredited)

Member of the Tribe

Dr. Randolph

Marshal Hunt

Mr. Porter (uncredited)

Mailman (uncredited)

U.S. Secretary Platt

Doctor

Mr. Hillman

Academy Awards Attendee (uncredited)

O'Hanlon, Pinkerton Agent (uncredited)

Lowell

Judge Lamar

Judge Knox

The Commissioner

Naturalists' Conference Chairman

First Explorer

Man Outside the Club (uncredited)

Mutate Council Leader

Sir Arthur

Dr. Pelham

Malcolm Smith [Ch. 10]

Mr. Creely (uncredited)

Dr. Graffner

Professor Krantz

Sam Foster