Comet! : the origin of Supergirl's horse [DC Super-Pets Origin Stories]by Korte, Steven 

BTSB Prebound(Stone Arch, 2022)

BTSB #: 530186 Available

Dewey: FAges: 6-8   
AR: 3.6 MG Lexile: 620 F&P: M

Genres: Adventure Fiction Animals

Subjects: Supergirl - (Fictional character) Superheroes - Fiction Centaurs - Fiction Mythical animals - Fiction Horses - Fiction

Summary: The centaur Biron is accidentally transformed into a horse by a grateful Circe (she meant to make him human) and given superpowers to make up for the mistake; confined on an asteroid by an evil wizard, Biron is freed by Kara Zor-El's rocket and follows her to Earth where he eventually decides to fight evil as Comet the superhorse alongside Kara, who has grown up to be Supergirl.