A 12 episode serial starring Rex, the King of the Wild Horses and Rin-Tin-Tin, Jr. Rex is brought from the island of Sujan, where he is worshiped as a God-Horse, to the U.S. to be trained as a polo pony. He escapes, meets Rinty and with the help of Frank Bradley is returned to Sujan. The natives have been persuaded to turn against their God-Horse, however he is rescued just in time before he is burned as a sacrifice.

• Mascot Pictures
• Rex
• Rin-Tin-Tin Jr.
• Kane Richmond
• Norma Taylor
• Mischa Auer
• Smiley Burnette
• Harry Woods
• Pedro Regas