Franklin Pangborn
Mr. Pinkney
Irving Bacon
Omar Tennyson Gimpel
Herbert Rawlinson
J. J. Stark Sr.
Kay Linaker
Mrs. Madge Carmen
Rosemary La Planche
Miss LaPlanche, Dr. O'Brien's Nurse
Chester Lauck
Lum Edwards
Norris Goff
Abner Peabody
Ivan F. Simpson
Professor Albert Frisby (as Ivan Simpson)