Roy Atwell

as Doc (voice) (archive footage)

as Salesman

as Mr. Pippensigal

as Senator Sam H. Smiley

as Dick Saunders

as Arthur Sidney

as Bearded Man on Ship (uncredited)

as Professor Kockerthaler

as Doc (voice) (uncredited)

as Vale

as Professor Washburn

as Jake Eben

as Julius Vandergulder

as Himself

as Announcer

as Jerry Sidon

as Arthur Tirrey - Casting Director

as Horace Kane

as Marmaduke Grubb

as Jim Conwell

as Harkness Boyd

as Winston Gates

as Self