As the season progresses, the Justice League raises the possibility that a mole has infiltrated the Team. This mystery creates ongoing suspense and mistrust among the young heroes.
– Robin takes the Team undercover at Haly’s Circus—the very circus where his parents died—to investigate a string of high-tech thefts occurring across Europe.
During a brutal alien invasion, the Justice League is completely wiped out, leaving the Team as Earth's final line of defense. One by one, the young heroes are brutally killed in battle. Artemis's death causes Miss Martian to lose control of her psychic powers, trapping the entire Team in a catastrophic, comatose state. The entire scenario is revealed to be a training simulation gone horribly wrong. Episode 17: "Disordered"
As of 2026, Young Justice Season 1 is available on multiple streaming platforms: young justice season 1 episodes
On their first official covert mission, the Team travels to Santa Prisca to investigate a disruption in the production of the drug Venom. They find themselves caught in a turf war between Bane and the Cult of Kobra, who are manufacturing a dangerous blockbuster formula called "Venom-Tar." Leadership struggles between Robin and Aqualad nearly ruin the mission, leading Robin to realize he isn't ready to lead. Aqualad steps up as commander. Episode 5: "Schooled"
This mid-to-late season run represents Young Justice at its most ambitious. "Revelation" exposes the Light's leadership, "Failsafe" emotionally destroys the team before rebuilding them, and "Misplaced" delivers one of the most creative and high-stakes episodes of the entire series.
Mount Justice is infiltrated by Red Torpedo and Red Inferno, the robotic siblings of Red Tornado. Artemis and Robin, the only members without superpowers, must rescue their captured teammates. As the season progresses, the Justice League raises
– The Team receives a new member, Artemis, a mysterious archer claiming to be Green Arrow's new protégé. They are tasked with protecting a scientist from the deadly League of Shadows and their high-tech assassin, Cheshire.
The thief is revealed to be Parasite. Robin steps up as a leader, and the team unifies despite the looming threat of the mole investigation. The Climax: The Mole Revealed Episode 25: "Usual Suspects" Original Air Date: April 14, 2012
Superboy’s journey to define himself outside of Superman's legacy and Miss Martian’s struggle with her true form are central to the emotional depth of the season. During a brutal alien invasion, the Justice League
During a routine training simulation, the Justice League is seemingly killed by an alien invasion. The team must step up to defend Earth, but one by one, they are brutally killed in action.
Red Arrow uncovers a plot to start a war between the nations of Rhelasia and Qurac, involving the League of Assassins. This episode highlights the serious, high-stakes nature of the covert operations. The Light and The Mole
Young Justice was created by Greg Weisman (known for Gargoyles and The Spectacular Spider-Man ) and Brandon Vietti, who deliberately avoided replicating the lighter tone of Teen Titans . They pitched it primarily as a "spy show" set in the DC Universe, focusing on how young heroes navigate the gray areas of morality that adult heroes avoid.
It is revealed that has been working with an alien race called The Kroloteans . The Kroloteans are tech-stealers who have been kidnapping humans and replacing them with imposters. This explains the erratic behavior of several global figures and some Justice League members.