Young Justice is an American animated television superhero series developed by Greg Weisman and Brandon Vietti for Cartoon Network and later HBO Max, based loosely on a broader range of characters from the DC Universe. Set on Earth-16 within the DC Multiverse, the show focuses on the lives of teenage superheroes and sidekicks, particularly the core characters, Robin (voiced by Jesse McCartney), Kid Flash (Jason Spisak), Aqualad (Khary Payton), Superboy (Nolan North), Miss Martian (Danica McKellar), and Artemis (Stephanie Lemelin), who operate as a covert team under the supervision of the Justice League. Across its four seasons, the series evolved from a teen drama-spy series into an adult drama that explores more mature topics.
Development began between 2008 and 2009, based on an amalgamation of DC characters, particularly Young Justice and Teen Titans, and initially set during the early days of the superhero era, before much of the established DC continuity. It serves as a reboot, focusing on the formative years of the DC Universe through selected characters reflecting that timeline. Later, the series evolved into exploring more characters and various storytelling across its seasons.
The series premiered on Cartoon Network in 2010. It ran for two seasons over multiple hiatuses before being canceled in 2013. However, following strong fan support, it was revived for a third season, titled Young Justice: Outsiders, which premiered on DC Universe in 2019, followed by a fourth season, Young Justice: Phantoms, on HBO Max in 2021. Although the series has not been officially canceled, no new season has been greenlit, despite the creators confirming having plans for three more seasons.
The series was critically acclaimed for its mature, complex storytelling, and it became a cult favorite and one of Cartoon Network's highest-rated shows during its original run. It was also one of the top, most in-demand digital original series in the United States from 2019 to 2025.
Premise
Young Justice spans four seasons, with each episode dated to reflect its place in the timeline. Set within the DC Multiverse, specifically on Earth-16, the series centers on a team of young sidekicks fighting to make a name for themselves: Robin, Kid Flash, Aqualad, Superboy, Miss Martian, and Artemis, who operate as covert agents under the guidance of the Justice League. Although the Justice League exists in the show, they are mostly kept in the background. The first season unfolds over roughly six months, during a time when superheroes are still a "relatively new phenomenon". It focuses on how these sidekicks come into their own, gradually introducing the characters and ultimately bringing the team together.
The second season, subtitled Young Justice: Invasion, picks up five years after the first season ended, and shortly after introduces new characters who would join the team, including Barbara Gordon, Garfield Logan, Blue Beetle, and Lagoon Boy. Other characters would also join, though they would not make the final cut. This season revolves around an alien invasion, during which the team departs Earth to undertake a mission on an alien planet called Rann. Justice League remains present but with reduced involvement as they face their own challenges. Co-producer Vietti explained that this shift was designed to "force the team into the frontline position of defending Earth, giving more space for the characters to grow and "come into their own as adults".
The third season, subtitled Young Justice: Outsiders, takes place a few years after the events of season two. It centers on an international arms race involving the trafficking of teenage metahumans, the story expands further with the introduction of Darkseid and the planet Apokolips, launching the team into intergalactic and global conflicts. Fourth session subtitled Young Justice: Phantoms focuses on the core characters from the first season—now adults—while continuing to expand the roster with new heroes. Structured around six interconnected arcs, it follows them as they navigate adulthood, personal trauma and other topics.
Episodes
Teen Titans Go! crossover and cameo appearance The first crossover occurred in the Teen Titans Go! (2013–present) episode "Let's Get Serious" (2015), where members of Young Justice, criticize the Titans for being immature. The Titans then attempt to act more serious. Producer Aaron Horvath noted that the episode served as a "meta" commentary on fan criticisms comparing Teen Titans Go!s comedic tone to the more serious Young Justice, describing it as a direct response to those complaints. A second crossover appeared in Young Justice: Outsiders (2019), in the episode "Nightmare Monkeys", where Beast Boy experiences a hallucination of a fictional cartoon called Doom Patrol Go!, animated in the style of Teen Titans Go!.
Characters based on the show versions of Zatanna, Artemis Crock, Wonder Girl, and Miss Martian, make a cameo appearance as home viewers in Scooby-Doo! WrestleMania Mystery (2014). In 2020, Young Justice characters made another cameo in Teen Titans Go! in the episodes "Justice League's Next Top Talent Idol Star: Second Greatest Team Edition" and "Justice League's Next Top Talent Idol Star: Justice League Edition".
Cast and characters
The first season features 179 characters from the DC Universe, with the second season increasing the total to 241 characters. The initial six main characters were selected by the producers from a pool of 50 to 60 potential teenage superheroes from DC Comics. The following is a list of core characters: Dick Grayson (Jesse McCartney) is the first Robin, the protege of Batman and a young genius who uses high-tech gadgets and security hacking. During the time skip between seasons one and two, he outgrows the Robin identity to become Nightwing. He serves as the Team's leader in the second season, until returning the duties back over to Aqualad. He was also best friends with Kid Flash. Kaldur'ahm (Khary Payton) is Aqualad, an original character and the protege of Aquaman from Atlantis, who can breathe underwater and use hydrokinesis, the ability to increase the local specific density of water and then manipulate its shape. He is the leader of the Team, who is a natural due to his calm and level-headed demeanour. In the second season, he takes part in a deep cover mission to infiltrate the Light, pretending he betrayed the Team after discovering he is the son of Black Manta. In the third season, he becomes the second Aquaman and joins the Justice League. Wally West (Jason Spisak) is Kid Flash, the protege of the Flash. He is capable of running at hypersonic speed. He was the Team's resident flirtatious jokester, always quick with a joke or comeback, but gradually grows more mature and later begins a romantic relationship with Artemis. In the second season, he retired from heroics and left the Team with Artemis, but returned to help stop the impending alien invasion and later dies saving the world from an alien bomb in the finale. He is later seen in hallucinations by various characters in the third season. Superboy (Nolan North) is a Kryptonian-human hybrid who is a genomorph clone of Superman and shares several of his abilities. He later takes the human name Conner Kent, joins the Outsiders at the end of the third season and eventually inspires the Legion of Super-Heroes in the 31st century. He is also in a longtime romantic relationship with Miss Martian and they get married in the series finale. M'gann M'orzz or Megan Morse (Danica McKellar) is Miss Martian, a White Martian and the niece of Martian Manhunter. Like her uncle, she possesses telekinetic, empathic and telepathic abilities as well as flight and shape-shifting. In the first season, she is a rookie who lacks formal training, but later discovers her powers are far stronger than initially realized. By the second season, she has fully mastered her powers, but began to abuse them for most of the season until she eventually realized the error of her ways. She is also in a serious committed romance with Superboy and they marry by the end of the series. Artemis Crock (Stephanie Lemelin) is the protegee of Green Arrow, although she initially pretends to be his niece to the Team to hide the truth of her criminal family background. She is a highly athletic fighter and expert archer and weaponist. She takes on the identity of Tigress for the deep cover mission in the second season and later makes it her new permanent identity following the death of Wally West.
Production Concept and development The series began development between 2008 and early 2009, just after Greg Weisman finished producing The Spectacular Spider-Man (2008–2009) and Brandon Vietti directed the DC animated film Batman: Under the Red Hood (2010). Around that time, Sam Register, executive vice president of creative affairs of Warner Bros. Animation, approached them to develop a new animated series, and after several early concepts were shelved, Register proposed a show based on the concept of a cross between the Teen Titans and Young Justice (1998–2003) series of comics, but was not solely an adaptation of one or the other, with Geoff Johns, chief creative officer of DC Entertainment, and Phil Bourassa, lead character designer for the show, also played a role in the conception and development process.
The title chosen for the show was Young Justice, as Weisman explained that it was meaningfully aligned with the concept the creative team had in mind. Although it shares a name with the 1998–2003 comic series, the show is not a direct adaptation. Instead, the show is loosely based on the comic, Teen Titans, and a broader range of characters and stories from the DC Universe, serving as an amalgamation with a particular focus on the sidekicks of that world, rather than on "classic heroes". A new tie-in comic series of the same name was also released alongside the show.
The series is set during the early days of the superhero era, before much of the established DC continuity. In that sense, it serves as a reboot, focusing on the early years of the DC Universe through characters like Wally West and Dick Grayson, who were chosen over Bart Allen and Tim Drake to reflect that earlier timeline. There are several differences in the team's line-up compared to the comics. Miss Martian was added because the timing of her arrival on Earth fit within the show's early-universe concept. Aqualad, rather than Robin, is established at the beginning as the team's leader. The version of Aqualad featured in the show is an entirely new character, created by producers Weisman and Vietti, with Bourassa designing the character.
Additionally, Artemis Crock was introduced in place of Arrowette, as the producers' desire to focus on her storylines. Some characters also had their ages adjusted from their original comic versions; though the spirit and intent of the characters remained intact. Characters from the Teen Titans comic roster also appear in the series, including Garth, the original Aqualad who later becomes the third Tempest in DC Comics; Arrowette, the team's archer in the Young Justice comic series; and Wonder Girl, who was initially excluded due to legal restrictions but was later allowed to appear.
Writing and themes