Spilling out of the stunning finale of "Codename: Patriot," in which Supergirl's biological father and Flamebird's surrogate father, Zor-El, was murdered, the childhood friends find themselves at each other's throats but must work together to track down their father's assassin, the man known as Reactron. It's the final showdown between Flamebird, Supergirl and the man who killed their father. And for the Daughters of Zor-El, that means it's payback time. Will Reactron make it out alive? Or is Superman and Lois Lane's surrogate son, the Kryptonian code-named Nightwing the only one who can save them all?