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