- Fred Aldrich - Roustabout (uncredited)
- Clyde Beatty - Fred Mason (in long shots) (archive footage / uncredited)
- Turhan Bey - End Narrator (voice)(uncredited)
- Eddie Borden - Dock Spectator (uncredited)
- Ray Corrigan - Cheela the Gorilla (uncredited)
- Russell Custer - Curley (uncredited)
- Fern Emmett - Beth's Murdered Neighbor (uncredited)
- Virginia Engels - Trapeze Artist (uncredited)
- Alexander Gill - Waiter (uncredited)
- Gus Glassmire - Coroner (uncredited)
- Joel Goodkind - Small Boy (uncredited)
- William Gould - Sheriff (uncredited)
- Al Haskell - Al (uncredited)
- Harry Holman - Dock Ticket Office Clerk
- Tom London - Ship's Captain (archive footage)
- Charles McAvoy - Cop (uncredited)
- Frank Mitchell - Handler (uncredited)
- Charles Morton - Dock Worker (uncredited)
- Edward Peil Sr. - Jake - Handler (uncredited)
- Stanley Price - Man on Dock (uncredited)
- Joey Ray - Attendant (uncredited)
- Cap Somers - Roustabout (uncredited)
- Ray Walker - Ringmaster (uncredited)
- Anthony Warde - Tony - Handler (uncredited)
- Grant Withers - Veterinarian (uncredited)
- Edward Dmytryk
-
Griffin Jay, Henry Sucher
- Charles Previn
- Bernard B. Brown
- Hans J. Salter
- Hans J. Salter
John Carradine hace el papel de Dr. Sigmund Walters.
Evelyn Ankers interpreta a Beth Colman en la película.
Milburn Stone interpreta a Fred Mason en la película.
Lloyd Corrigan hace el papel de John Whipple.
Fay Helm interpreta a Nurse Strand en la película.
Martha Vickers hace el papel de Dorothy Colman.
Acquanetta interpreta a Paula Dupree, the Ape Woman en la película.
Vince Barnett interpreta a Curly en la película.
Paul Fix interpreta a Gruen en la película.
Fred Aldrich hace el papel de Roustabout (uncredited).
Clyde Beatty hace el papel de Fred Mason (in long shots) (archive footage / uncredited).
Turhan Bey interpreta a End Narrator (voice)(uncredited) en la película.
Eddie Borden interpreta a Dock Spectator (uncredited) en la película.
Ray Corrigan interpreta a Cheela the Gorilla (uncredited) en la película.
Russell Custer interpreta a Curley (uncredited) en la película.
Fern Emmett interpreta a Beth's Murdered Neighbor (uncredited) en la película.
Virginia Engels hace el papel de Trapeze Artist (uncredited).
Alexander Gill interpreta a Waiter (uncredited) en la película.
Gus Glassmire interpreta a Coroner (uncredited) en la película.
Joel Goodkind interpreta a Small Boy (uncredited) en la película.
William Gould interpreta a Sheriff (uncredited) en la película.
Al Haskell interpreta a Al (uncredited) en la película.
Harry Holman hace el papel de Dock Ticket Office Clerk.
Tom London interpreta a Ship's Captain (archive footage) en la película.
Charles McAvoy hace el papel de Cop (uncredited).
Frank Mitchell interpreta a Handler (uncredited) en la película.
Charles Morton interpreta a Dock Worker (uncredited) en la película.
Edward Peil Sr. interpreta a Jake - Handler (uncredited) en la película.
Stanley Price interpreta a Man on Dock (uncredited) en la película.
Joey Ray hace el papel de Attendant (uncredited).
Cap Somers hace el papel de Roustabout (uncredited).
Ray Walker interpreta a Ringmaster (uncredited) en la película.
Anthony Warde interpreta a Tony - Handler (uncredited) en la película.
Grant Withers interpreta a Veterinarian (uncredited) en la película.
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