Season 1

2010 · 26 episodes

Robin, Aqualad, Kid Flash, Superboy, Miss Martian, and Artemis form Young Justice -- and find out whether they have what it takes to be a proven hero.

1Independence Day (1)Robin, Aqualad, and Kid Flash break into Cadmus and find that it is being run by Genomorphs.
2Fireworks (2)The sidekicks find a clone of Superman known as Superboy. They free him from Cadmus' control, while battling Blockbuster.
3Welcome to Happy HarborAfter Speedy declines to join the new team, Robin, Aqualad and Kid Flash fear Young Justice is just a big joke…while new member Miss Martian fears there's no room for her to be part of it. So when the four heroes and Superboy come up against Mister Twister, it looks like all their fears have just been realized…
4Drop-ZoneYoung Justice goes on its first official mission under Batman, while trying to determine which of them will lead the team.
5SchooledSuperboy's anger over his non-relationship with Superman is getting out of control. He refuses to train with Black Canary, and when the team faces an opponent that even the Justice League had trouble defeating, the Boy of Steel goes rogue.
6InfiltratorGreen Arrow's niece, Artemis, joins Young Justice and must save a bright young scientist from the League of Shadows.
7DenialWhen the team investigates the disappearance of Kent Nelson (formerly Doctor Fate), the scientific-minded Wally West is forced to confront his disbelief in magic while battling Abra Kadabra and Klarion the Witch Boy, for the ultra-powerful Helmet of Fate.
8DowntimeAfter a disastrous mission with the team, Aqualad returns to Atlantis to choose between a life on the surface world or one beneath the waves with the Aquagirl of his dreams. But other forces at play may make Aqualad's decision for him.
9BereftYoung Justice discovers that they have forgotten the last six months of their lives, including each other and a final fateful mission in Bialya. The team turns to Miss Martian to recover their memories, before it is too late for Superboy.
10TargetsRed Arrow is on his own against the world's most dangerous assassins in preventing the League of Shadows from starting a war, until he is forced to make an unlikely alliance with someone even more dangerous. Aqualad fails to convince Red Arrow to ask the team for help.
11TerrorsSuperboy and Miss Martian go undercover inside Belle Reve Penitentiary.
12HomefrontWhen Mount Justice itself is attacked, can Artemis and Robin (the two teens without super-powers) save the Team (or even themselves) from the unknown invaders?
13Alpha MaleAlready exhausted and rattled after a home turf invasion of The Cave, the team learns that Aqualad - their friend and leader - withheld vital information that put them all at risk. When Batman sends the Team and new "den-mother" Captain Marvel to India to investigate bizarre reports of armed animals attacking human beings, can Aqualad pull his fractured team together?
14RevelationWhen Plant Creatures attack major cities around the world, the team is eager to join the fight alongside the Justice League. Instead, Batman assigns them a still more dangerous task - taking out the plants' masters: a secret society of super- villains: the Injustice League!
15HumanityThe team is on the hunt for Red Tornado, determined to find out once and for all whether the robot was the mole - even if it means kidnapping new friend Zatanna and dragging her along on their quest!
16FailsafeWhen the Justice League is defeated during an alien invasion, the Team has to step up and fill their mentors shoes.
17DisorderedSuperboy's "Sphere" goes through a surprising change, revealing a connection to the forever people of New Genesis.
18SecretsIt's Halloween. Artemis and Zatanna are in Manhattan for a girls' night out. There, they encounter the deadly Harm, who has a secret.
19MisplacedWhen every adult on the planet disappears, only the team, Zatanna, and Billy Batson are left to defeat the five most powerful sorcerers on Earth. In the end, Zatanna officialy joins the team and Zatara becomes the new Doctor Fate.
20ColdheartedWally West comes oh-so-close to fulfilling his birthday wish to finally fight alongside the Justice League. Instead, a massively disappointed Kid Flash is taken off the mission and tasked with a simple delivery job. But a few deadly surprises await the birthday boy along the way.
21ImageA covert operation against Queen Bee in Qurac forces Miss Martian to finally face her greatest fears and her biggest secrets. But will she reveal those secrets to her friends—or allow what she's hiding to take down the entire team?
22AgendasSuperboy returns to Project Cadmus, where he learns the top-secret genetics lab may have created another Super-clone.
23InsecurityRed Arrow's return undercuts Artemis' confidence, while the team's mission to track down Sportsmaster threatens to expose her darkest secrets.
24PerformanceThe Team goes undercover at the Haly International Traveling Circus to locate a thief stealing weapons technology across Europe. But a thief isn’t all they find…
25Usual SuspectsThe Team gets a new member and a new mission – a mission that may finally expose all the Team’s secrets... and all their lies!
26Auld AcquaintanceThe Team finally learns the identity of the traitor in their midst, forcing a battle against an enemy more dangerous than any they’ve ever faced before!

Episodes