Episode guide

"Infiltrator" is the sixth episode of the first season of Young Justice, and the sixth of the overall series. It premiered on February 11, 2011.


Artemis faces an uphill battle winning over her new teammates, as she tries to fill Red Arrow's boots on a mission he initiated: saving a brilliant young scientist from the League of Shadows.[1]


Infinity Island
August 7, 23:49 ECT
Red Arrow extricates Serling Roquette

Red Arrow rescues Dr. Serling Roquette from the League of Shadows.

Red Arrow (formerly known as Speedy) breaks into a facility, eluding surveillance and the guards. In a secured room, Dr. Serling Roquette is working on a project and is told to finish it soon or she will die. Red Arrow breaks in and dispatches the two guards standing watch. The alarm sets off and Red Arrow blasts a hole through the wall. Roquette doesn't want to leave her project behind, but Red Arrow presses on, saying he can only take one of them. She reluctantly agrees to go with him. The two descend on a zip line and make their way to a boat. Red Arrow takes off under heavy fire and sets off explosives to cover their escape.

Back on the island, Professor Ojo informs Sensei that Roquette had finished her project. Sensei grins in delight.

Mount Justice
August 8, 09:58 EDT
Fun at the beach

The Team (sans Wally) has fun at the beach.

Miss Martian, Dick, Kaldur and Superboy go to the beach, but not before taking a moment of silence for their absent comrade.

Central City
August 8, 09:00 EDT
Green Arrow introduces Artemis

Green Arrow introduces Artemis.

Wally attends his first day of sophomore year in despair. While the Team has fun, Wally's day goes from bad to worse. After class, he Zeta-Beams into the Cave, fully equipped for his day at the beach, but trips over and falls on his face. He notices that Green Arrow, Batman and Red Tornado are there, and so is a new costumed girl—Artemis. She mocks him for his clumsiness and introduces herself as his new teammate. Wally quickly dismissed her, and Green Arrow readily introduces her as his new protégé.


Red Arrow explains what the Fog is.

No sooner than Wally asks what happened to his old partner, the Computer announces Speedy's arrival, who promptly declares that now he goes by "Red Arrow". He lashes out at Green Arrow for finding a new substitute so quickly, and both Artemis and Green Arrow state that she is his niece. Robin scoffs in disbelief and Aqualad assures Red Arrow that they still want him on the Team. Red Arrow tells them he saved Dr. Roquette from the League of Shadows, but not before she had completed the project they coerced her to do—The Fog, a nanotech weapon capable of disintegrating anything in its path, all the while collecting valuable data.

Miami Beach
August 8, 21:38 EDT
Ojo unleashes the Fog

Professor Ojo unleashes the Fog.

At the Miami Beach University, Professor Ojo unleashes the Fog to infiltrate the MBU Robotics Laboratory, stealing raw data from their computer systems. After Ojo downloads the stolen information, he drives off and the building collapses behind him.

Back at the Cave, Red Arrow explains that with this weapon the League of Shadows can gain access to assorted tech and Intel, and Artemis states that the Shadows will use it for extortion, manipulation, and power broking, which is typical of them. Wally contests her knowledge of the League of Shadows, but Artemis simply replies with a silent grin, infuriating him.

Red Arrow tells them that Roquette is currently working on a virus to neutralize the Fog and has sheltered her at a local computer lab. Green Arrow tries to convince Roy to work with him on this case, but Batman stops him with a knowing look. Green Arrow then tries to sway him to work with the Team, which now includes Artemis. Red Arrow declines and teleports out, after updating the Computer with his new moniker. Wally and Artemis exchange displeased looks.

Happy Harbor
August 8, 21:53 EDT
Roquette desperate

Artemis and Kid Flash's bickering gets on Roquette's last nerve.

At Dr. Serling's hideout, Artemis, Aqualad, Robin and Kid Flash watch over her and Miss Martian establishes a telepathic link to prevent the Shadows from intercepting their communications. Artemis and Kid Flash start bickering, so she takes off to help Miss Martian outside. Robin suggests Kid Flash to go easy on Artemis, since she was the one who saved him from Amazo, but Wally is unyielding.

Roquette grumbles about her predicament and Aqualad asks if she can track the Fog so that they can use the virus on it. She is, but she needs to go on-line, which would expose their location. Aqualad assures that they'll protect her, so Serling goes on-line to track the Fog.

August 8, 21:57 EDT
Ojo tracks Roquette

Professor Ojo tracks Roquette and informs Sensei.

Professor Ojo is aboard a plane and detects Roquette. He informs Sensei and proceeds to track her into Happy Harbor. Sensei inquires which agents they have in that vicinity.

Meanwhile, Superboy is securing the perimeter and hears something, but disregards it. He leaps across the building and lands next to Miss Martian and Artemis, who mentally admires him, despite being fully aware that everyone can hear her telepathically.
Cheshire lurking

Cheshire lurks in the shadows.

Aqualad informs them that Roquette has found the Fog and instructs Miss Martian to reconfigure the Bio-Ship so that Robin and Superboy can go after it. As they take off, a masked figure lurks in the shadows.

She makes her way past Artemis and Miss Martian, who are too distracted arguing over Superboy. Miss Martian chides her for embarrassing Superboy and asks if she must challenge everyone. Artemis claims that where she comes from, that's how one survives.

Aqualad duels Cheshire

Aqualad duels the assassin Cheshire.

Inside, Kid Flash is standing guard at the lab door when he spots a shadow. He pursues the intruder into the pool, where he slips in a booby-trap, gets knocked out and dumped into the pool. The intruder—Cheshire—heads to the lab and hurls a poisoned shuriken at Serling, but Aqualad jumps over and takes it instead. She hits Aqualad with three more but he simply removes them with ease, claiming that Atlantean skin is quite dense. The two spar and he calls for Miss Martian and Artemis for help. On their way, Miss Martian is held back and turns back to the pool.

Cheshire evades

Outnumbered and overpowered, Cheshire uses a flash-bang grenade to sneak away.

Amidst the brawl, Cheshire throws one of her sai at Roquette, but Aqualad deflects it just barely. Cheshire notes that the poison is hindering him, but Aqualad asserts he is largely immune to jelly-fish toxic. She knocks him down and raises her sai to execute him, but is stymied by Artemis, who has just arrived. Meanwhile, Miss Martian removes Kid Flash from the pool. Back at the lab, Cheshire is delighted in seeing Artemis and deflects her barrage of arrows with a collapsible sword. When Miss Martian and Kid Flash join in, Cheshire realizes she's outnumbered and uses a flash-bang grenade to evade them.

STAR Labs demolished

STAR Labs crumbling after being ravaged by the Fog.

Roquette scolds the Team for letting Cheshire get away, while Kid Flash blames Artemis for letting the assassin slip by her perimeter. Miss Martian stands up for Artemis, as she too was standing guard outside, and then comforts her. Robin and Superboy inform Aqualad that they arrived too late to Philadelphia, because the Fog had already cleaned and destroyed its target—STAR Labs. Aqualad instructs him to ascertain the Fog's next target while they move Roquette.

Cheshire brings backup

Cheshire returns with backup.

At their new secluded location, Kid Flash and Artemis are watching over Roquette, and outside, Aqualad bellows to Miss Martian remain camouflaged and make a wide perimeter sweep. Suddenly, he is attacked by two other Shadows agents—Black Spider and Hook—and is knocked out. Cheshire joins in and instructs them to assassinate Roquette quickly, before Miss Martian interferes.

Miss Martian fooled Cheshire

Miss Martian playing bait.

Black Spider breaks in and Kid Flash takes him on. Hook sneaks from behind Artemis and she wards him off and tells Roquette to keep working. Cheshire sneaks up from the skylight and takes aim at Roquette. She shoots, but her arrow is blocked by a levitating table. Cheshire warns the other agents that Miss Martian is there and urges them to fulfill their mission. Roquette makes a run for it, but Cheshire knocks her down. As she prepares to do away with the doctor, Roquette morphs into Miss Martian, and Cheshire realizes they have been tricked.

Aqualad is standing watch inside the Sandbar Internet Café, when the real Roquette is close to completing the virus. Meanwhile, Robin and Superboy are en route to a Wayne Tech facility, the Fog's next target, and Robin decides that they don't have enough time to evacuate the building. Professor Ojo pulls over at Wayne Tech, and prepares to launch the Fog.

Back at the school lab, Cheshire tells Black Spider and Hook to keep the Team busy while she goes after Roquette. Artemis purses her, after telling Kid Flash to dispose of the other assassins. Kid asserts that he doesn't take orders from her and Artemis snaps at him.

Cheshire grabs hold of Artemis

Cheshire overpowers Artemis.

Outside, Cheshire tracks Roquette's trail with infra-reds. Artemis engages and then subdues her with knockout gas. When Artemis comes closer, Cheshire sweeps her down and says that her mask has built-in filter. Artemis tries to take her on, but Cheshire immobilizes and knocks her out with ease, wishing her better luck next time.

Cheshire knocks Aqualad out

Cheshire knocks Aqualad out.

At the café, Roquette is transmitting the virus, when Cheshire distracts Aqualad and sneaks in from behind. She hits him with three poisoned darts, attempting to test his immunity to jellyfish toxin. Aqualad still tackles her, but is clearly overwhelmed and Cheshire knocks him out with a single kick. She turns towards Roquette, without realizing that the virus is completed as is being transmitted.

Outside Wayne Tech, Robin is receiving the virus, when Superboy sees Professor Ojo. He lunges at him, but is repelled and knocked out by Ojo's energy beam. Ojo unleashes the Fog and Robin follows it inside Wayne Tech, using his override codes to bypass the security system.

Meanwhile, Miss Martian and Kid Flash are still fighting the assassins, and Miss Martian urges her teammate to end it quickly. Kid Flash knocks Black Spider out, while she dispatches Hook.

Cheshire and Serling

Cheshire plans to kill Serling for the entertainment value.

While the Fog ravages through Wayne Tech, Robin taps into the mainframe. Cheshire is about to kill Serling, but realizes that the virus had been completed. Given that her mission was to stop Roquette from accomplishing this, she no longer has a reason to carry on. So, she spares Roquette, observing that the League of Shadow may one day find another use for her.

Robin destroys the Fog

Robin destroys the Fog, saving Wayne Tech.

Robin successfully uploads Roquette's virus and destroys the Fog. Outside, Professor Ojo sees the Fog dissolving and Superboy closes in. Ojo hits him with another blast, but Superboy is able to withstand it, pushing his way to Ojo and knocks him out.

Artemis confronts an acquaintance

Artemis confronts an acquaintance.

As Cheshire is leaving the café, Artemis shoots four explosive arrows at her, knocking her mask off. Artemis is shocked at recognizing her. Cheshire teases Artemis, saying that she will obviously be arrested and interrogated by her teammates, but wonders if Artemis's position is secure enough for them to learn everything she knows. After a moment of consideration, Artemis stands down, and Cheshire disappears elated.

Aqualad steps outside, aided by Roquette, and asks where Cheshire is. Artemis tells him with a guilty expression that she got away. Kid Flash arrives at that moment and scoffs her for failing her mission. Miss Martian arrives too, with Black Spider and Hook restrained together. Kid Flash picks Cheshire's mask and Aqualad asks Artemis if she saw her face, but Artemis lies.
Artemis welcomed to the Team

Artemis is welcomed to the Team.

Aqualad comforts her, stating that the Fog is destroyed and Roquette is safe, also thanks to her. He welcomes Artemis to the Team and shakes her hand. Miss Martian says she always wanted a sister, despite having twelve on Mars. Artemis claims she wouldn't know. Miss Martian nudges Kid Flash to welcome Artemis as well, and the two shake hands.
Gotham City
August 9, 01:16 EDT
Red Arrow warns Artemis

Red Arrow issues a stern warning: do not hurt my friends.

Artemis teleports to a back alley phone box and swiftly draws her bow at a lurking figure. Red Arrow steps from the shadows, praising her move, but states that she is not Green Arrow's niece. He determines, however, that both Green Arrow and Batman must have a reason for lying, so he won't expose her cover, but vehemently warns her not to hurt his friends.

Back on Infinity Island, Sensei informs the council of the Light that before his capture, Ojo transmitted the STAR Labs intel, but they failed to secure the data from Wayne Tech. L-2 contemplates yet another interference from the young heroes, but takes solace in the fact they have an operative on the inside.


Various entities and individuals in this episode could be considered infiltrators. Red Arrow infiltrates the League of Shadows base on Infinity Island. The Fog is composed of microscopic robotic infiltrators that can hack any system and retain the information. Artemis is regarded as an infiltrator of the Team, particularly by Kid Flash, due to her sudden and unsought enrollment in the Team. The League of Shadows assassins (e.g. Cheshire) infiltrates the Happy Harbor High School in order to kill Serling Roquette. At the end of the episode, the Light indicates that they have an operative that has infiltrated the Team.

Cast and characters

Voice actor Character
Stephanie Lemelin Artemis  
Jesse McCartney Robin
Danica McKellar Miss Martian
Nolan North Superboy
Professor Ojo  
Khary Payton Aqualad
Jason Spisak Kid Flash
Oded Fehr L-2  
Crispin Freeman Red Arrow
Kelly Hu Cheshire  
Tara Strong Serling Roquette  
Alan Tudyk Green Arrow
Keone Young Sensei  
Non-speaking roles
Black Spider  
Other members of the Light
Red Tornado
Full credits
7 Character debut
1 Speaking debut
0 Episode debut



"Infiltrator" garnered an average of 2.1 million viewers among kids between 2 and 14.[2]



  • In the scenes at Keystone High, Wally misses his freckles.
  • While splashing water with Miss Martian, Robin is laughing with his mouth clearly closed.
  • When Artemis sarcastically asks Wally what his powers were, she is depicted with full gloves rather than fingerless gloves.
  • Sensei's scarred eye changes coloration between shots.
  • The map on Ojo's computer shows a map of Asia before it zooms in on Happy Harbor.
  • When Aqualad throws off Cheshire's shurikens, the writing on the board behind him is mirrored.
  • The American flag on the wall in the pool has 61 stars instead of 50.
  • In the scene where Cheshire noticed Roquette finished the virus, the door sign for the Internet cafe is not mirrored.  It should be, because the sign is supposed to be read from the outside, but was shown from the inside.   
  • When Cheshire enters through the window to attack Roquette, Artemis's eyes are blue.

Cultural references

  • Artemis calls Wally "Baywatch" when he comes into the Cave dressed in beachwear. Baywatch (1989–2001) was a TV series about a group of lifeguards and their misadventures.
  • Cheshire mentions her namesake, the Cheshire Cat, and his tendency to disappear. In Alice in Wonderland, the Cheshire Cat makes a habit of disappearing gradually.


  1. Do not answer here.
  2. Keep the questions open-ended and neutral: do not suggest an answer.
For complete answers to the questions in this section, click here.

Answered questions


  • Robin: You might cut her some slack. It was her arrow that saved your butt against Amazo.
  • Kid Flash: What? No! That was Speedy's—I mean, Red Arrow's—arrow. Right?
  • Robin: Not so much.
  • Kid Flash: Hmph. Well, still not giving her the satisfaction.
  • Artemis: You know, I can still hear you!

  • Artemis: Mmm...that boy.
  • Miss Martian: He can hear you. We can all hear you.
  • Artemis: Oh, I know.

  • Miss Martian: Must you challenge everyone?
  • Artemis: Where I come from, that's how you survive.

  • Aqualad: Stop it, both of you.
  • Kid Flash and Artemis: What?
  • Aqualad: I can hear you glaring.

  • Kid Flash: This is all your fault! How'd that Shadow get in?
  • Miss Martian: That's not really fair. I was outside too.
  • Kid Flash: Outside being distracted by her! Besides I can't be mad at you. [Thinking] You gave me mouth to mouth.
  • Everyone: We heard that!
  • Kid Flash: Dang it!

  • Cheshire: I suppose now you will bring me to justice, let your new friends interrogate me. I wonder if your position is secure enough to survive them learning everything I know. Didn't think so. So like the Cheshire Cat, I'll just disappear.

  • Artemis: Step into the light, now!
  • Red Arrow: Nice move. Almost made me believed you are Green Arrow's niece. Though we both know you're not. Still, I'm sure G.A. and Bats have a reason for lying, so your cover's safe, for now. But I warn you, do not hurt my friends.


  1. Allstetter, Rob (2011-01-29). "YOUNG JUSTICE EPISODES FOR FEBRUARY". Comics Continuum. Retrieved 2011-01-30.
  2. Gorman, Bill (2011-02-15). Ratings Notes for TBS, TNT, Cartoon Network; Including 'Conan,' 'Southland,' 'Clone Wars,' NBA & More. TV by the Numbers. Retrieved 2011-08-14.
  3. Batman: Assault on Arkham. Retrieved 2014-11-07.

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