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!
The incredible members of the Justice League of America cast a long shadow, and the members of Young Justice are eager to step out of it and prove to their superhero mentors that they’re capable of tackling super-villains on their own!
