Dark Crisis: Young Justice

"Crises have always had devastating impacts on the generation of heroes that make up Young Justice, and Dark Crisis will hit them even harder. Tim Drake, Impulse, and Superboy go missing during the Justice League's funeral. The only person concerned enough to find them? Cassie Sandsmark, a.k.a Wonder Girl. But the three boys of Young Justice aren't on this Earth anymore: they're on the world of their dreams, one they may never want to leave"--