John Forrester aka Eric Jann aka Peter Korotoff

Walter Connolly

Margaret Forrester

Doris Kenyon

Henry Braverman

Rollo Lloyd

Henrietta Crosland

Maidel Turner

Jamison - Ship's Officer

Hugh Huntley

Puppeteers

Yale Puppeteers

Clifford (uncredited)

Walter Brennan

Constable Malcolm (uncredited)

Charles Middleton

Jack Forrester

Robert Young

Jack Forrester, Age 4

Scotty Beckett

Carlo - the Puppeteer

Henry Kolker

Peter Korotoff

Akim Tamiroff

Professor Weaver

Gilbert Emery

Niccoli

George Humbert

Alec Klein

Hobart Bosworth

Jack Forrester - Age 14

Macon Jones

Director

Walter Lang

Story

Albert Payson Terhune

Producer

Felix Young

Screenplay

Sidney Buchman

Special Effects

John Hoffman