Lex sends his new team of super-powered teenagers on a mission... to rescue Young Justice.
An intergalactic conqueror comes to Earth with plans to take the planet for his own.
Roy Harper goes after the man responsible for keeping him imprisoned for eight years and making a clone for him.
A traveler from the future visits Young Justice but may not be who he claims. Meanwhile, Red Arrow and Cheshire go on a quest to find Roy Harper.
Superboy and the Blue Beetle go on a mission against Intergang, while Nightwing tries to help a former teammate.
Young Justice takes on its most dangerous enemy after they discover who within the team is the traitor.
A new member joins Young Justice just as they must face internal struggles as the moles make their identities clear.
Young Justice tries to find a thief using the Haly International Traveling Circus as cover for his activities, but find much more.
Artemis discovers that she's out in the cold when Red Arrow returns to Young Justice to help them track down Sportsmaster... who is tied to her mysterious past.
Superboy discovers that he may not be alone when he learns that Cadmus created another clone of Superman. Meanwhile, the League votes on new members.
Artemis and Zatanna decide to go partying on Halloween night, only to discover that a youthful assassin, Harm, has set his sights on them. Meanwhile, Miss Martian and Superboy take Kid Flash to their high school Halloween dance.moreless
Red Arrow rejects Young Justice's help and attempts to prevent the League of Shadows from starting a war. Ultimately he finds himself working with an even deadlier ally to fight the League's assassins.moreless
Robin, Aqualad, Kid Flash, and Speedy are finally ready to join the Justice League as full members. However, they soon discover that are to be treated as "junior members." An enraged Speedy leaves, while the other three strike out on their own to investigate a mysterious fire at Cadmus Laboratories. The trio soon discovers that Cadmus conceals a major conspiracy, and one of its goals is to create a clone of Superman for their own ends.moreless