Superboy! Wonder Girl! Robin! Impulse! Amethyst! They and other young heroes are united as Young Justice in this first collection of stories from the new Wonder Comics line! When the nightmare dimension known as Gemworld invades Metropolis, these teen heroes will unite to deal with the situation-but they're shocked to discover the battle may be the key to the return of Conner Kent, a.k.a. Superboy! Collects Young Justice #1-6.