Roy Atwell

Doc (voice) (archive footage)

Self

Salesman

Dick Saunders

Senator Sam H. Smiley

Mr. Pippensigal

Arthur Sidney

Professor Kockerthaler

Bearded Man on Ship (uncredited)

Doc (voice) (uncredited)

Vale

Professor Washburn

Julius Vandergulder

Jake Eben

Himself

Announcer

Jerry Sidon

Arthur Tirrey - Casting Director

Marmaduke Grubb

Winston Gates

Harkness Boyd

Jim Conwell

Horace Kane