Doc (voice) (uncredited)
Mr. Pippensigal
Winston Gates
Jim Conwell
Salesman
Professor Washburn
Jake Eben
Arthur Sidney
Arthur Tirrey - Casting Director
Dick Saunders
Bearded Man on Ship (uncredited)
Professor Kockerthaler
Himself
Harkness Boyd
Julius Vandergulder
Vale
Jerry Sidon
Senator Sam H. Smiley
Self