Burn 'Em Up O'Connor

Dennis O'Keefe

— Jerry O'Connor

Cecilia Parker

— Jane Delano

Nat Pendleton

— Buddy Buttle

Harry Carey

— P.G. Delano

Addison Richards

— Ed Eberhart

Charley Grapewin

— Doc Heath

Alan Curtis

— Jose "Rocks" Rivera

Tom Neal

— Hank Hogan

Tom Collins

— Lefty Simmons

Frank Orth

— Tim McKelvy

Frank M. Thomas

— Jim Nixon

Si Jenks

— Jenkins

Clayton Moore

— Hospital Interne (as Jack Carlton)

Barbara Bedford

— Woman in Movie House (uncredited)

Helen Jerome Eddy

— Susan, Laboratory Analyst (uncredited)