Herbert Carter
Porter
Roger Bronson
Judge
Dr. Sherman - Graham's physician at inquest
George Rennit, private investigator
Minister
Museum Director Barton
Duncan
Dr. van Arken
Judge Prentiss
Higgler
Frederick
Storekeeper
Rankeillor
Mr. Briggs (uncredited)
Professor O'Neill
Dr. Danson (uncredited)
Timothy Helgelander (uncredited)
Undertaker (uncredited)
Josiah Borden
Dr. Fawcette (uncredited)
John Hayes
Dr. Henry Bender
Jan
Party Guest (uncredited)
Frank Smith
Dr. Gallen Altheim
Bullard
Dr. Galt (uncredited)
Hastings' Butler (uncredited)