The JLA are the world's greatest heroes, but their associates aren't quite ready to fill those shoes. United by their mission of improvement, they become more than just sidekicks; they become the TEEN TITANS -- the world's greatest heroes-in-training. The JLA are the world's greatest heroes, but their associates aren't quite ready to fill those shoes. United by their mission of improvement, they become more than just sidekicks; they become the TEEN TITANS -- the world's greatest heroes-in-training.