By Anthony Couto. CBS has cast Laura Benanti (Nashville, Go On) as Supergirl's mother, Alura Zor-El, in the upcoming DC Comics-based TV series. According to Deadline, Benanti's version of Alura Zor-El will appear in a recurring role, and is described as, A strong noblewoman, Alura sends Kara to Earth to escape Krypton’s destruction.