Young Justice focuses on the lives of a group of teenage sidekicks attempting to establish themselves as proven superheroes as they deal with normal adolescent issues in their personal lives.
Robin, Aqualad, Kid Flash, and Speedy (later revealed to be a clone of the original Roy Harper) are invited by their mentors Batman, Aquaman, Flash, and Green Arrow to tour the Hall of Justice and sit in on a meeting of the Justice League. At the last minute however they are called away. This angers Speedy, who resigns from being a sidekick. The other three use this as an opportunity to prove themselves and investigate a fire at Cadmus Labs. While there they uncover a clone of Superman named Superboy.
