Supergirl is a television series based on the DC Comics character Kara Zor-El, Superman's cousin, who is also a survivor from Krypton. The show follows her journey as she embraces her powers and her identity as a superhero, balancing her personal life with her role as a protector of National City. The series explores themes of heroism, identity, and family, while featuring a diverse cast of characters and thrilling action sequences.