Fan Casting Supergirl in Superman III: The Reign of Brainiac (1996)

Kara Zor-El, also known as both Kara Kent and more famously as Superman, is the secondary protagonist of Superman III: The Reign of Brainiac. Kal-El’s cousin who also survived the destruction of Krypton and now also protects Earth as Supergirl. Now, both she and Superman are forced to do battle with both Brainiac and Lobo in order to stop the complete destruction of Earth.