Supergirl and the daughter of Lex Luthor, Lena, have come together to battle a common enemy posing as Midvale’s very own Supergirl! Will Lena’s brains and Kara’s brawn be a match for the super-powered supergenius from Kandor? It’s Supergirl versus Supergirl in a fight for the ages! Plus, the debut of Satan Girl?!