Comet the Super-Horse was a pet horse belonging to Supergirl. Born as a centaur in ancient Greece, a witch had cast a spell on him that allowed him to switch between both forms. She also gave him a variety of other super-powers, including immortality. Whilst on a mission with Supergirl on another planet, he was given the opportunity to turn into a human, but only while a comet passed through the solar system. As a man, he adopted the identity of rodeo star "Bronco" Bill Starr. He was also a member of the Legion of Super-Pets.
Comet the Super-Horse was created by Leo Dorfman and Jim Mooney, first appearing in Adventure Comics #293 (1962).
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