After the murder of her father, Supergirl has scoured Earth for his killer—Reactron. But now that all Kryptonians are banned from the planet, she’s gone from friend to fugitive overnight. With Earth watched over by Squad K—a government-sponsored, anti-Kryptonian unit—Supergirl is on the run. When Reactron and his yellow Kryptonite join the Squad, the Girl of Steel finds her target coming at her!
 
Can Supergirl bring Reactron to New Krypton to stand trial if, on Earth, he is the hero and she the villain? How far will she go to deliver justice to a world that no longer believes in it…or her?