Milly Alcock as Kara in Supergirl (Warner Bros.) James Gunn and Peter Safran, the new heads of DC Studios, are slowly building out their DC Universe. It launched last year with Superman, in which Supergirl made a cameo, and now she gets a standalone instalment all of her own. The film follows Kara Zor-El (Milly Alcock), the cousin of Kal-El/Superman (David Corenswet), who has been planet-hopping and drinking her feelings instead of dealing with the loss of her home planet Krypton and her family.