In Old Kentucky

Horse trainer Steve Tapley is caught between the feuding Martingale and Shattuck families. He sides with young Nancy Martingale and her grandfather Ezra, and the feud is to be resolved by a horse race between the favorites of each family. Unfortunately, the Martingale's horse, Greyboy, only runs well in mud. And it hasn't rained in a long time.

• 
  George Marshall

• 
  Will Rogers
  Steve Tapley
• 
  Dorothy Wilson
  Nancy Martingale
• 
  Russell Hardie
  Dr. Lee Andrews
• 
  Charles Sellon
  Ezra Martingale
• 
  Louise Henry
  Arlene Shattuck
• 
  Esther Dale
  Dolly Breckenridge
• 
  Alan Dinehart
  Slick Doherty
• 
  Charles Richman
  Pole Shattuck
• 
  Etienne Girardot
  Pluvius J. Aspinwall, the Rainmaker
• 
  John Ince
  Sheriff
• 
  Bill Robinson
  Wash Jackson