Rex

1924

• [ ] Lightning Romance (A Horse (as Rex the Wonder Horse)) 
• [ ] The King of the Wild Horses (The Black (as Rex the Wonder Horse)) 

1925

• [ ] The Black Cyclone (Rex (as Rex the Wild Horse)) 

1926

• [ ] Rex the Devil Horse (The Devil Horse (as Rex - King of Horses)) 

1927

• [ ] No Man's Law (Rex, a Wild Horse (as Rex the Wonder Horse)) 
• [ ] Wild Beauty (Thunderhoof, a horse) 

1928

• [ ] Guardians of the Wild (Rex - a Wild Horse (as Rex the Wonder Horse)) 
• [ ] Two Outlaws (Rex, a Horse (as Rex King of the Wild Horses)) 

1929

• [ ] Hoofbeats of Vengeance (Rex, the Wonder Horse) 
• [ ] Wild Blood (Rex, Mary's Horse (as Rex the Wonder Horse)) 
• [ ] Plunging Hoofs (Rex (as Rex the Wonder Horse)) 
• [ ] The Harvest of Hate (Rex, the World's Greatest Horse (as Rex the Wonder Horse)) 

1930

• [ ] Parade of the West (Mankiller (as Rex King of the Wild Horses)) 

1931

• [ ] The Vanishing Legion (Rex) 

1933

• [ ] King of the Wild Horses (Rex (as Rex the Wonder Horse)) 

1934

• [ ] The Law of the Wild (Rex King of the Wild Horses) 

1935

• [ ] Stormy (Rex (as Rex King of Wild Horses)) 
• [ ] The Adventures of Rex and Rinty (Rex, The King of Wild Horses) 

1936

• [ ] Robinson Crusoe of Clipper Island (Rex, the Wonder Horse) 

1938

• [ ] King of the Sierras (Diablo)