The Adventures of Superman: Joey (1956)

Synopsis
Season Four of The Adventures of Superman opens with a sentimental story about a racing filly named Joey. Formerly owned by a girl named Alice (Janine Perreau) and purchased by "The Daily Planet", Joey has the potential to be a winner, but refuses to race unless Alice is around. As this story plays itself out, Clark Kent (George Reeves)--otherwise known as Superman--goes after a band of criminals who've been spreading their corruptive influence at the racetrack. ~ Hal Erickson, All Movie Guide