Roy Atwell

as Doc (voice) (archive footage)

as Self

as Salesman

as Dick Saunders

as Senator Sam H. Smiley

as Mr. Pippensigal

as Arthur Sidney

as Professor Kockerthaler

as Bearded Man on Ship (uncredited)

as Doc (voice) (uncredited)

as Vale

as Professor Washburn

as Julius Vandergulder

as Jake Eben

as Himself

as Announcer

as Jerry Sidon

as Arthur Tirrey - Casting Director

as Marmaduke Grubb

as Winston Gates

as Harkness Boyd

as Jim Conwell

as Horace Kane