 In a "pocket universe" created by the Time Trapper, a good version of Lex Luthor existed.Years after Superboy (his reality's only hero) died to protect the pocket universe, Lex accidentally releases three Phantom Zone criminals led by General Zod.With no other super-powered beings in his universe to confront them, Lex creates his own Supergirl, an artificial being composed of proto-matter and based upon the image and memories of a recently killed Lana Lang.