Both Ethan and Aiden were bitten by this unnamed alpha. They became part of his pack. However, they weren't like other members of the pack, they were omegas. The "bitches". The last to eat after every meal. Eventually, an alpha called Deucalion shows up and offers them a way out. They listen to him and kill their alpha, claiming his alpha status for each other. Then they kill of the rest of the pack. Wile with Deucalion, he taught them how to control sifting together. They eventually mastered it and became part of the Alpha Pack. 
The Alpha Pack
Braeden's motorcycle speeds through the night in a urban area. Isaac is still barely conscious before he begins to hear something, which alerts him. Someone’s following them, on foot. It’s another Werewolf with claws and teeth bared. A second Werewolf appears and the girl speeds up the bike. The Werewolf are twins. They claw at the bike, causing it to swerve dangerously. Red eyes are seen, revealing that the werewolves are alphas. The girl stops the bike in front of a wall. She drives the bike toward the alphas before jerking away from them sharply. The bike crashes through a window into a warehouse, and Isaac passes out. He falls off the bike, causing them to crash. The twin alphas enter the warehouse through the gaping hole in the window and mold themselves into one much larger werewolf as Isaac watches. Isaac attempts to army crawl (must be a Hale pack thing), and the girl tells him to get down before shooting with some type of stun gun. The electric shock forces the alphas to separate, but by the time the lights of the stun gun stops flashing the alphas are gone. The next day, Ethan and Aiden walk into school, after being checked out by Lydia. 
While Scott is on the way to school, he notices Aiden and Ethan but doesn't say anything to Stiles. Aiden is in the library with his brother when he is approached by Lydia. They exchange numbers. 
Aiden an his brother approach Isaac during practice and Scott tries to reason with him, but Isaac refuses to listen. Isaac seems to lose them on the trail before he’s suddenly attacked and shoved down a shallow hill. Scott intervenes before they can actually hurt him, and all four wolves have partially shifted before they hear a scream and find the guy from the vet, killed like the others. The Sheriff appears at the scene with other deputies and tries to get the kids off the crime scene. Aiden seems confused by the murder. Later, Isaac wonders out of class when he sees both Aiden and Ethan. Aiden punches Ethan and Isaac stops in confusion. Isaac watches as one twin completely beats the crap out of the other before swinging him at Isaac’s feet and walking away. Isaac, essentially framed, receives detention. Later, Isaac and Scott are walking through the hall after school when the twins appear. They strip off their shirts, leaving Scott and Isaac confused, before combining into the larger alpha. Isaac’s ready to fight, but Scott pulls him away. They don’t make it far before getting caught, but Deucalion appears and the twins separate, knowing that they've been caught. Deucalion slices them both on the cheek with the blade in his cane before leaving. The twins follow him. 
Back at the mall, Derek makes the first move by running at Deucalion before being intercepted by Kali. Boyd takes on Ennis while Isaac goes for the twins in their combined form, and with resignation, Scott shifts and joins the fight. Deucalion simply watches as his pack takes on the Hale pack and Scott is shown receiving the torso wound that Allison had to stitch up. The alpha pack brings the fight to a stand still, and Deucalion delivers the ultimatum that Derek must kill Boyd, but the others will be let go. Derek hesitates, and Kali tells him that he must choose between pack or family while shifting her position on top of Cora, making the bones in Cora’s neck creak. As Derek struggles to make a decision, Allison appears with flashing arrows. The arrows cause enough confusion for both Cora and Boyd to get up. Scott rushes at Ennis with red eyes, but they quickly fade to yellow. Derek and Ennis begin to fight. Scott claws at Ennis’s calf, the only thing he can reach, and Ennis stumbles, which is the movement that causes both him and Derek to pitch off the platform. Sometime after, Aiden and the pack retreaves the body and takes to to the animal clinic. At the vet’s office, the doorbell rings and Morell enters with Aiden and Kali, carrying a mostly dead Ennis. Deaton doesn’t want to help them, and the pack can’t force its way in because the the clinic is made of mountain ash. Morell reasons that if Ennis dies the alpha pack will be out for blood and end up hurting the pack, and Deaton opens the gate. Ennis dies and Kali goes outside. She roars, causing some of the car alarms to go off. Aiden calms her down. 
At the school, Lydia and Aiden are getting it on in Coach's office when the fire alarm goes off. Lydia gets her things together to go, and Aiden asks where she's going. She'd like not to die, thank you. She tells him to go first, and he leaves. Later, the pack goes after Derek at his loft. Aiden and Ethan use Ms. Blake as leverage for Derek's cooperation. Derek and Kali fight in the water. The power comes back on and they both get electricuted. Aiden and his brother rush over to grab Boyd and raise him into the air while Kali held out Derek's claw. They drop Boyd on it, killing him. As they exit, Kali gives Derek an ultimatum; join the alpha pack by the next full moon or she will kill all of Derek's Pack next time. As the twins follow her out. 
Out in the hallway, Aiden tells Ethan that he needs to stop seeing Danny. "He's harmless," Ethan replies. He points out that Lydia is the one they're supposed to worry about. Aiden demands to know why Ethan is still talking to Danny, and Ethan evades the question. "What do you think we're doing here? You know we're not actual high school students, right? We're here to eliminate a threat." Ethan defends himself by saying that since Danny is harmless, the threat is eliminated. Aiden smiles because he realizes that Ethan's starting to actually like Danny. He asks if Ethan would kill Danny if Deucalion ordered him to. "If Deucalion asks you, would you kill me?" Ethan replies. Aiden repeats his order for Ethan to stop seeing Danny or he'll rip the flesh off his face and eat it. Lydia gets Aiden into the Coach's office and starts kissing him, but he's not immediately into it. He says he's surprised since she's barely talked to him since he killed Boyd. "I told you that was Kali. I didn't have a choice." Lydia tells him that she thought they were all alphas. "Yeah? Well it's not as democratic as it sounds." He further claims to not feel remorse because Derek killed Ennis. Apparently no one is aware that Ennis would have lived if Deucalion didn't crush his skull. Aiden then informs Lydia that there was a time that Derek and Boyd tried to kill her. Lydia stares at him. "How did you know about that?" Before Aiden can answer, someone scratches a revenge spiral on the frosted glass on the door. Aiden takes it a threat from Derek. Aiden opens the door to the office and calls Derek out. Lydia threatens to scream. "You wanna fight, Derek, come and get me!" Aiden says. Cora attacks him from the side. Aiden roars at Cora and grabs her by the throat. He throws her across the locker room, and then picks up a weight from the bench press. Lydia begs him to stop, but he beats Cora on the head with the weight. He's about to hit her again, but Scott and Ethan stop him. "Aiden! You can't do this!" "She came at me!" "It doesn't matter! Kali gave Derek until the next full moon. You can't touch him or her." Aiden looks at Lydia, and he stops resisting. Ethan nods at Scott and takes his brother away. Stiles thinks Cora's hurt worse than she looks. Later that day, he accompanies his brother to the concert. Ethen is with Danny, Aiden watches closely. In the audience, Aiden searches around looking for his phone. He can't find it. The music at the concert gets more sinister, and the people in the audience start to notice. Ethan and Aiden look concrned. The musicians pound away at their instruments, playing like they are possessed. The pianist strikes the right note, and the piano string snaps. It slices her neck open. People scream and start running. 
At the hospital, the alpha twins have formed Voltron and roar. Derek wolfs out, and he and the Melded Wolf run at each other. Derek tries to tackle him, but the big guy slams his elbow into Derek's back and then starts punching him in the face. Scott hurries to help and jumps off a wall to slash at the twins. Derek and the alpha twins turn to see Jennifer escaping down the elevator. Scott and his friends run. When the Melded Wolf bursts through the doors, Stiles hits him over the head with the bat, shattering it to splinters. The Werewolf roars at him, and Stiles edges away. In silhouette, the twins separate. Aiden accuses Ethan of hesitating, but Ethan says that he pulled back, which is different. Aiden says they're protecting Jennifer. "They don't have a choice!" Ethan argues. "Neither do we!" If all the sacrifices she's been making are going to give her the power to get rid of the alpha pack, then they need to get rid of her first. The backup generators click on. They merge again and Peter bursts through the doors like a zombie with the needle stuck out of his chest. He pulls out the needle and drops it. He and Scott face off against the twins. "All right, boys. Let's rumble." Peter and Scott hold back the alpha twins but not for long. Later, Scott is in the hallway by himself, listening carefully. He hears something drop, and then the twins attack. They pin Scott up against the wall and demand to know where Ms. Blake is. "We're trying not to hurt you!" "Try harder," Scott grunts. Melissa shouts at them to get their attention, and they drop Scott. "I'd like to try something," she says, then hits them with a pulse from the defibrillator. The shock knocks the twins apart, and Scott looks up at his mom in awe. Together, they run for it. Not long after, they go back to stalking the hallways. Derek opens the elevator doors, making a noise that catches the twins' attention. The twins check around but think they're on the wrong floor. They hear footsteps of a woman running and race to find her. As soon as Isaac sees the twins, he guns the car. Kali leaps out of a window and lands just as the twins follow Allison out of the hospital. Allison turns and fires some arrows. Chris opens fire with his pistols as well. They all scatter and escape. The twins find their way back to Isaac and head towards his car before he drives off. 
Ms. Morrell is running through the dark woods with the twins on her tail. She runs into a clearing and then throws up a mountain ash circle around herself. The twins throw themselves against it and bounce off. Kali joins the fight. Deucalion walks into the clearing and wants to know how Ms. Morrell knew they'd come for her. She says that she and Jennifer are the same and that she knew Deucalion had always been suspicious of emissaries. Kali adds that it's with good reason, because she sent Braeden to get Isaac. Ms. Morrell maintains that she did that to maintain balance. She then turns to Scott and tells him that this isn't him. Ms. Morrell tells Scott to go back to his friends. Duke replies that Scott can make decisions for himself. She asks Duke if he's told Scott everything he's done. "How you've piled up bodies in a narcissistically psychotic effort to form your perfect pack? Bodies that include Ennis, by the way." Morrell looks at the pack as she says this and explains that Ennis was alive when Deucalion went in to see him. Duke takes his cane and throws the blade into Ms. Morrell's chest. As she falls, she breaks the mountain ash circle. Scott rushes to her side. The rest of the wolves move to attack, but Scott tells them to back off. He pulls the cane out and tosses it aside, assuring Morrell that he's not going to let the pack kill her. 
The alarm in Derek's loft goes off, and Kali knocks it off the wall. "Where is he?" she demands. Lydia snaps her fingers and glances at Ethan. "I think he said he was heading out to do some shopping, run a few errands, the usual Werewolf afternoon." Kali is not impressed and threatens Lydia. Lydia tells her that she needs a pedicure and offers to give her a referral. Aiden growls as Kali closes in on Lydia, and Kali turns to face him. "Oh, really?" Kali circles around Aiden and asks him if he took his assignment too seriously. Aiden tells her that Lydia is not the problem. "Maybe the problem is where your loyalties lie." Lydia asks Ethan if this is about to get really violent. "Probably." Then Jennifer drops in from the roof, breaking through the glass ceiling. She glares at Kali. "So, who wants to go first?" Ethan holds Lydia protectively while Kali and Jennifer fight. Jennifer easily dodges Kali's kicks and punches, then lands a hit on her that sends her flying. Aiden does even less well. Ethan then tears his shirt off and goes to join his brother. They try to meld, but Jennifer grabs them by their throats and forces them apart. She then goes after Kali and kills her. Ethan and Aiden meld together to form Voltron, and Jennifer turns to face them. They take a single swing, and she ducks and spins around, then grabs them by the neck and breaks it over her shoulder. After she leaves, Cora and Lydia get up to leave. As they're leaving, they hear a sound behind them and the twins separate. Cora realizes that they're alive. Cora and Lydia bring the twins to the Animal Clinic. They put each one on a table, and Lydia takes Aiden's hand. Cora asks Deaton if he can save them, but he has they have to start healing on their own. Deaton gives Ethan and Aiden oxygen and some shots. Not long after, Cora helps Ethan to his feet, and Aiden tells Lydia that he knew that she cared about him. Back at school, Aiden and Lydia chat near her locker. 
The twins make some sort of deal with Scott to teach him how to roar. Scott, Stiles, and Lydia meet the twins at Derek's loft. They attack Scott from behind and start throwing him around the place, pummelling him. They glow their eyes, they are no longer red, they are now blue. Bleeding, Scott says he thought they were going to teach him to roar. They reply that in order to roar he has to give in to his animal nature. Stiles points out that he tried to teach Scott control once by using a heart monitor and lacrosse balls, but hey, maybe beating the crap out of Scott is better. Scott's incredulous that this is actually their plan. Their plan is make Scott so angry that he turns and kicks their asses. They taunt him and punch him some more, telling him to give in and be the monster. They tell him that giving in doesn't make him the bad guy as long as he can control it. Aiden thinks control is a little overrated. Scott does start to get a little angry, and he rushes at Aiden, but Aiden slams him on the table and starts punching him in the face. Ethan stops him. Scott spits blood but does not roar. 
Scott arrives at school and sees Ethan and Aiden waiting for him. The twins say they're not back at school, they just want to talk. Stiles comes up and says that must be a change of pace for them, since usually they're just hurting, maiming, and killing. Ethan says that Scott needs a pack and they need an alpha. Stiles isn't having any of that. Ethan argues that they helped when Scott couldn't roar. Stiles points out that all they did was beat the crap out of Scott, which really doesn't qualify as helping. Scott asks why he would say yes to them. "We'd make you more powerful. There's no reason to say no." Stiles almost rolls his eyes out of his head. Isaac joins the conversation and points out, "I could think of one. Like the two of you holding Derek's claws while Kali impaled Boyd." Isaac is totally up for fighting the twins right now, but Scott stops him. Scott refuses to let them into the pack because none of them trust them. Scott, Isaac, and Stiles walk away. Ethan asks what they're going to do now, and Aiden just looks at the Beacon Hills High School sign. Ethan's incredulous that Aiden actually wants to finish high school. He asks if it's about Lydia. Aiden replies that it's about proving to Scott that they should be in his pack. Aiden doesn't want to be an omega. He's worried about what will happen to them when all the people they've hurt find out that they don't have a pack to protect them. "We're dead on our own." "Dead's still better than being back in high school." Ethan says he's not going back, but then he sees Aiden staring at something over his shoulder. He turns to see Danny talking to another boy. Jealousy changes Ethan's mind, but only if Aiden will take math class for him. Aiden goes to see Lydia at her locker. She tells him no. He cannot show up with his cute little smile, the dark eyes, the brooding forehead, the muscles and suddenly they're ripping each other's clothes off in Coach's office. He just keeps smiling at her, and they do try to go to Coach's office. The desk has fallen over, though, so they leave to try the guidance counselor's office. Later, Scott meets up with Isaac, Ethan, and Aiden so they can try to track Barrow through scent. Ethan and Aiden head down a hallway in the basement. Ethan thinks he hears something, and when they round the corner, they find Danny kissing the boy he was talking to earlier. Ethan is distressed. Aiden thinks it's funny. Danny acts a little ashamed. They all meet up again after they have found nothing. 
Danny walks away, and Aiden comes up to his brother. "You want to throw a Halloween party? What's next, we gonna join the Yearbook Club?" Ethan explains to his brother that he just wants to do something nice. "You don't get it, do you? Scott doesn't care about power. He cares about people. You wanna be a wolf in his pack? Try being a human in high school." Aiden sits next to Lydia in Biology class. Aiden asks Lydia why she's copping an attitude, since he's not the one who killed Mr. Harris. She doesn't answer at first. Then she says, "The other night, I helped save someone's life. That felt really good. And I look at you, and all I can think is that you helped kill Boyd. You're not just a bad boy, Aiden, you're a bad guy. And I don't want to be with the bad guys." Aiden then turns around and tells Danny that he thinks he knows a place where he can have his party. Up in the loft, Danny checks the place out. He asks Ethan where the guy who lives there is. "He's out of town." Aiden is outside starting the generator. Ethan flips on the blacklights, and Danny smiles. Lydia is by herself. Aiden sneaks up on her and growls with glowy red fake teeth. "Not as good as the real ones," he says. "Or as lethal," she replies. "Okay, sure, I deserve that. I deserve basically everything you say. But, you know, I was pretty instrumental in setting all this up." Lydia is not impressed. She tells him that if she wanted to go to a rave she'd get into a time machine and go back to the 90s. She taps him on the arm and walks away. Aiden growls and shows his fangs in frustration. He then rebounds by grinding with two girls. Danny bumps into Aiden and calls him Ethan. Aiden corrects him, and Danny asks where Ethan is. No one's seen him for half an hour. Aiden looks worried and heads off to find his brother. Danny follows him. Danny finds Lydia freezing and Aiden wraps himself around her. Derek returnes home and stops the party. Everyone leaves. Aiden tells Danny to get Lydia out of there. The Oni are standing in the room waiting. They all turn to face Aiden. "Guys. They're all looking at me. Why are they all looking at me?" Scott and Derek both decide to attack. Derek manages to break one's neck, but it is unaffected and responds by throwing him into a pillar. Another one knocks Scott down. Isaac runs forward to try his luck, whipping out his claws, but the Oni draws a sword out of its chest, and he backs down. The Oni take Aiden and give him the mark. The sun comes up and shines through the loft windows, wiping the Oni away. "What the hell were those things?" Scott asks. 
Scott is riding his bike to school, when the twins drive up on either side of him. Scott looks at them both and then pours on the speed. They speed after him. When they arrive at school and take their helmets off, Scott asks them if they're going to following him all day. "All day." "All night." Scott asks if it's about being in his pack, "It's about you being the target of demonic ninjas," Aiden says. Scott tells them that he doesn't need protection, but Ethan counters that they were looking right at him when the sun came up. Chris think the Oni are only able to come out at night, but Ethan says that since this is their first encounter with demonic ninjas they should play it safe. Scott resigns himself to the twins following him around. He tells them that he has to talk to Stiles without them around. Aiden objects, but Scott insists that that's how it's going to be. And the twins aren't going to listen in. "How would you even know?" "I'm a True Alpha, you have no idea what I can do." In class, Ethan and Aiden ask Scott if he told Stiles about the Oni. He didn't because Stiles has enough on his mind right now. Scott then suggests that maybe the Oni aren't actually after him. What if they're after Kira. It's the end of the school day, and Scott is ready to head home. He tells Ethan and Aiden that while he appreciates them wanting to protect him, he has to be alone for a bit. He apologizes to them and drives off, while the twins are unable to start their bikes. Scott picks up Kira, who has the spark plugs from the motorcycles. They drop the plugs on the ground and speed away. That night, An Oni appears behind Kira. The twins burst through a window to take it on. They all concentrate on throwing the Oni outside the house. Derek throws the last Oni out, and Melissa runs to the front door and smashes a bottle of mountain ash on the threshold. It forms a perfect line and closes the seal. Kira and Aiden stand by the door, watching the Oni. She attempts to reach out beyond the door but is repelled by the seal. Aiden asks Kira what she is, and she pretends that she doesn't understand. Aiden takes her hand over Ethan's objection and brings it to the barrier so his brother can see that she can't pass through. "So what are you?" "She's a kitsune, idiot," Derek says. "Use your eyes. You can see it all around her. The younger ones give off an aura. She just hasn't learned how to conceal it yet. She probably doesn't know what kind she is, either." Aiden tells Derek that he wasn't going to hurt Kira. "Not yet," Derek replies, not looking at either twin. The twins explain to him that they're there to protect Scott and fight for him. "I'm sure you are. I'm sure you'd kill for him. But are you willing to die for him?" The twins look at each other and don't answer. Derek warns Scott that they're about to break through. The Oni step inside, and Scott tells everyone not to do anything. Aiden can't believe what he's hearing. Scott takes Kira's hand, and they submit themselves to the Oni's test. Derek holds Aiden back from intervening. The Oni toss Scott and Kira aside, giving them both the mark. Derek and the twins rush to help them. 
At the school, Lydia is in the art room sketching Aiden, who volunteered to be her model. He rolls his neck and drops his pose. "I said hold still," Lydia tells him. Aiden wonders if they're allowed in the school that late, and Lydia explains that with so many murders happening at the school they can't even find someone to take a late night security shift. "So we're all alone?" Aiden asks with a smile. Sitting around fully clothed wasn't what Aiden had in mind when Lydia asked him to model for her. He takes off his shirt and resumes his pose. Lydia grins at him. "If you're thinking nude modeling, it's usually done without the pants," she says. And next thing she hears is his zipper coming down. Aiden starts to take his underwear off too, but Lydia hears voices. Scott and Isaac go to Stiles's room and find Lydia and Aiden already there. Scott asks her if Stiles called her, too. "I heard it," Lydia says. Aiden tells them not to ask because it gets more confusing when you ask. "Not as confusing as this," Lydia says and turns so they all can see that the red cords from Stiles's evidence board have been tied to a pair of scissors impaled in his mattress. She explains that Stiles uses red for unsolved cases. "Maybe he think he's part of an unsolved case," Aiden offers. "Or is an unsolved case," Isaac says. Lydia asks why they're there, and Isaac and Scott explain that they came to his room to get a better scent. Stiles told them he's in an industrial basement, he's bleeding, and he's freezing. "Tonight's the coldest night of the year," Aiden says. "It's going to drop into the 20s." When Lydia asks what the Sheriff had to say, Scott is forced to admit that they haven't told him. Lydia is incensed. But because she didn't make any promises, she calls. Aiden points out that Stiles's Jeep is gone, so he didn't just walk somewhere. Scott tries to stop her. He'll call Derek and Allison. "Everyone except for the cops. Great idea!" Aiden points out that Lydia only gets banshee feelings when there's imminent death, so they don't have a lot of time to mess around. Scott agrees to head down to the station, which is only 5 minutes away. Aiden and Lydia continue going through Stiles's things. Aiden finds one of Lydia's nemeton sketches framed. She tells him to put it back. "He likes you a lot, doesn't he?" Aiden asks, clearly poking fun at Stiles's crush. Lydia makes him stop. She gets a text from Scott informing them that Derek is heading to the high school while Isaac goes to find Allison. Scott is going to stay with the Sheriff. Bored, Aiden plucks one of the red strings. Lydia turns suddenly, hearing voices. "What did you just do? Did you just touch one of the strings?" Aiden looks guilty. "Maybe." Lydia cautiously plucks one of the strings herself. She asks Aiden if he heard people whispering. "I definitely did not hear people whispering." She tries again and Aiden says "Lydia, I'm not sure anybody hears what you hear." She follows the whispers and the string to an image of Eichen House. It's the mental health center where Barrow was committed. Lydia tells Aiden that that's where Stiles is. The Sheriff, Scott, Lydia, and Aiden arrive at Eichen House. The Sheriff asks Lydia if she's sure. She swears that he is. They rush in and tell the front desk that they need access to all the basements in the facility. Aiden starts Derek's car while Derek sets jumper cables up on Stiles's Jeep. He asks if Derek thinks Stiles was just sleepwalking or if there was something more to it. "In this town, there's always something more." Aiden says that he listened in on Stiles telling Scott that he thinks he was the one who wrote the message in the Chemistry room. "You think Stiles, skinny, defenseless, Stiles, is the nogitsune? A powerful dark spirit?" Derek doesn't believe it. Aiden claims that he's not the only one thinking it, just the only one saying it. "This thing wants to possess someone and chooses Stiles? Why not take someone bigger, stronger? Someone with a little more..." Derek stops as he has a realization. "Power." He touches the jumper cables together, making a spark. 
The twins tell Scott that they're worried because there's no Stiles and no demonic ninjas for two days. "Things are getting too quiet." Scott admits that it's making him nervous as well. Then he hears the distant sound of one of Argent's sonic emitters. They follow the sound down to the basement and find Stiles standing in the corner holding the emitter. Stiles turns to face them. "Okay, I know what you guys are thinking. But it's me. I swear to God it's me." The twins ignore his pleas, flash their eyes and fangs, and attack him. Scott orders them to stop, but they don't. He throws Ethan off Stiles and grabs Aiden. Scott roars Aiden into submission. Stiles swears that he's himself. He doesn't know where he's been or what he's been doing the last two days, though. Scott, Stiles, and the twins unpack the bag with Stiles's gear. Scott finds a map with the cross-country trail highlighted. The highlighting ends at the crash location of the Tate's car, where Malia's dad put the steel-jawed traps. Scott, Stiles, and the twins pull up to the trail. They tell Coach there's a problem. Stiles runs up and tells everyone to stop. He looks in the leaves and finds a length of metal chain. Stiles pulls the chain up, but when he gets to the end, there's no trap. Stiles frowns. Coach asks if somebody could tell him what the hell is going on. He takes a step into a trip wire and gets shot in the gut with an arrow. "Oh, crap," he says as he falls. Coach screams in pain and orders them to get the arrow out of him. He keeps shouting and squirming in pain and panic. Stiles gives Scott a nod, and Scott starts taking some of Coach's pain. Coach passes out. Stiles looks at his blood-covered hands. "I coulda kill him. What if it was his head or his throat?" Scott assures him that it wasn't and Coach will be fine. Aiden hears an ambulance coming, and Stiles points out that his dad will be with them. 
Allison lets Scott, Ethan, and Aiden into the apartment. She explains that all the evidence is being moved to federal lock-up by armored car. Ethan is incredulous that they're going to rob an armored car. "Well, we're gonna try," Lydia tells him. Scott announces that their plan is a really bad plan. "It's not that bad," Lydia says. "It's not that good," Ethan counters. Aiden just rubs his forehead. The problem is that they don't know the route the car is going to take. If they can get one of the Argents' GPS trackers on the car, they can stage an accident when it gets to Roosevelt Bridge. When the driver gets out to help, "We attack them!" "No!" Lydia and Allison respond together. The twins will distract the driver while Scott breaks open the back door. Ethan asks why they aren't just going to Sheriff Stilinski for help. "Because if he gets caught then it's the sheriff tampering with federal evidence." Allison rallies them all and insists that they have to do this. At the truck, Scott is fighting Kincaid and he kneels next to him. "You have the eyes of an alpha, but where's the strength?" The twins appear on a balcony overhead. They leap down and attack. Lydia runs up and helps Allison to her feet. The twins have a much easier time fighting Kincaid than Scott did. Scott tells Ethan and Aiden to stop before they kill Kincaid. The twins insist that if they don't kill him, Kincaid will come after them. Scott takes the finger from Kincaid's coat and retrieves the scroll. "We're here to save a life, not end one," Scott says. 
Lydia and Aiden are in the car. Lydia's GPS tells her to turn right onto Gafner Blvd. Aiden sighs and asks her where they're going and who Malia Tate is. He holds up a note with Malia's address. Lydia tells Aiden not to worry about it. The GPS tells her to turn right on Commerce Way and continue for a quarter mile. Aiden declares that he's going to worry that they're lost, since they just made 4 rights, which is a circle. Lydia says it's a brand new car and the GPS was fine before. "Well, the GPS would work better if it was on." Lydia gives him a sarcastic look, then realizes that the GPS really isn't on. Lydia starts hitting the buttons on the stereo system, and Aiden realizes something is wrong. She pulls the car over into an empty parking lot and finds the nogitsune lying on the ground. A nogitsune fly lands on Aiden and crawls into his ear. Scott and Aiden carry the nogitsune to the couch in Scott's living room. Melissa claims that this is crazy and that he should be in the hospital. "Mom, you remember what happened last time he went to the hospital?" Deaton examines the wound in the nogitsune's stomach and declares that he isn't bleeding. "I think he might even be healing." "You mean healing like we heal?" Aiden asks. Scott thinks that might be good. Deaton agrees that it's good for the nogitsune but probably not so good for them. Aiden asks why they aren't tying the nogitsune down with really big chains if they aren't going to kill him. Deaton says he has something more effective and puts a dropper full of kanima venom in the nogitsune's mouth. The nogitsune immediately awakens and grabs Aiden by the throat. Scott manages to break the grip, and then the venom does its work. "Kanima venom. Nice touch," it says to Deaton. Aiden roars and charges at the nogitsune. "You know how they say that twins get a feeling when the other one's in pain? You didn't lose that talent too, did you? Oh, I hope not. You're gonna need it." Aiden and Scott look at one another, but Aiden doesn't move. The nogitsune pushes him by telling him that Ethan's at the school. Scott tells Aiden to go, and the nogitsune laughs. He likes the twins. "Short tempers. Homicidal compulsions. They're a lot more fun than you bakemono trying to save the world everyday." Danny and Ethan have finished their shower. After Danny's gone, Ethan realizes that Aiden is waiting for him in the corner of the hall. Aiden mocks him for trying out for lacrosse and not knowing what's going on with Scott's pack. "Why should I care? Scott's never going to trust us anyway. You see the way he looks at us? Like dogs that bit the neighbor." He thinks that if there's one more incident Scott will either kick them out of Beacon Hills or kill them outright. Aiden gets out his claws to prepare for a fight, and Ethan just sighs. This is precisely what he means. "I'd probably be in his pack right now if it wasn't for my psychotic brother. The one who has to kill everything in sight." They pace around each other. Aiden warns Ethan that he's currently the only thing in his sight. Allison attacks them. The twins and Isaac recover, and all three growl at Kira and Allison as they lock themselves in Coach's office. The Werewolf then start fighting each other. Kira fights Ethan and slices him across the chest. Allison shoots Isaac, but he just pulls the bolt from his chest and keeps coming. She kicks him out of the way. She can't reload fast enough to fight off Aiden, so Kira tosses her the katana. Kira picks up the crossbow, and they back up until they're both standing next to one another. 
Aiden was one of the first of the people to get the fly removed from them. Kira and Allison ask how there could be two Stileses and how one could just kidnap Lydia. Aiden is upset that no one actually noticed the nogitsune kidnapping her right out of the house. "Most of us were concentrated on the bizarre sight of a creature materializing from out of the floor," Deaton snarks at him. Kira asks how they're so sure which Stiles is which, and Deaton admits that they're trying to figure that out now. The next morning, Ethan and Aiden are running through Beacon Hills Preserve looking for some sign of the nogitsune. Ethan hears a gun chambering a round, and then suddenly there's a hail of bullets. The bullets are laced with wolfsbane, so the twins bleed black. Ethan looks over to see Aiden unconscious. Ethan drags Aiden through the woods. He runs out of strength, and they both fall. Ethan hears someone coming and tries to get up, but is suddenly pulled up to standing by Derek. Derek grabs Aiden and orders Ethan to run. Bullets smack into the trees around them. Ethan and Aiden are in a coyote den. Derek comes back in and tells Ethan to stay quiet. Ethan asks if Derek saw the shooter. "No, I was a little busy. Who else did the two of you piss off?" Aiden replies, "We pissed off everyone." Derek informs them that the bullets had wolfsbane (even though Ethan already knew that) and if he doesn't get them out of the woods soon the poison is going to spread. "Stay quiet. I'll be back." Derek and Chris haul Ethan and Aiden into Derek's loft. They drop them on the couch. 
Derek uses a lighter to burn the rest of Ethan's wolfsbane wound closed. Presumably he put some wolfsbane in the wound first, like he had to do with his own in Season 1. Derek snaps his lighter shut and tells them that they should be fine in a few hours unless they get themselves shot again. Aiden marches away, ready to go find Lydia. Derek asks if he's going to convince Lydia to go with him. "I'm gonna try and convince her to run and hide. Like any sane person would do." Derek looks at Ethan and asks if he intends the same for Danny. "Allison's dead. Stiles is dying. What do you think?" "I think Danny won't believe you. And Lydia would never run and hide." Aiden asks if he means because she wouldn't leave Stiles. But he means she wouldn't leave Scott. Derek then explains to them why they haven't been able to get into Scott's pack. "You don't fight for a leader. You fight for a leader's cause. Scott's always been about one thing. Saving his friends. He will do anything and everything to save the people he cares about. When there's no chance of winning, he keeps fighting. When all hope is lost, he finds another way. And when he's beaten down, he stands up again. You want to earn a place in his pack? You want redemption? Find another way to stand and fight." Derek walks up to the school, already wolfed out. The nogitsune is there to meet him with two Oni at his sides. "Did you bring us a present?" the nogitsune asks. Derek sets the triskele urn down. Aiden and Ethan join him as he replies, "I brought two." "I've heard of an alpha pack, Derek, but not a pack of former alphas." Derek says that he's not an alpha anymore, but he can still fight like one. This isn't much a threat given that Derek never won a fight when he was an alpha. Derek yells to the twins that one of them needs to make sure they protect the box. Two Oni appear next to it. "I hate ninjas," Aiden says, and goes to protect the box. The twins keep fighting. Aiden yells that they can't do this, they can't beat the Oni. Ethan tells his brother to take the box while he and Derek hold the Oni off. Derek throws an Oni down the steps. It gets up and prepares to attack again but is suddenly struck in the chest with a silver arrow. Derek looks over his shoulder to see Chris wielding a crossbow. "What was that?" Ethan asks. "Silver," Chris replies. Chris continues to shoot Oni. An Oni slices the last arrow before it hits, and Chris tells Aiden to get it because it's the last silver arrowhead. Aiden slides to grab the arrow, then spins and slams it into the Oni. Simultaneously, the Oni impales him with its sword. Ethan shouts his brother's name, as Aiden pulls the blade out and drops it. Derek has Aiden propped up as Ethan and Chris gather around him. "Does it hurt you as much as it hurts me?" he asks Ethan. Ethan cries and tells him yes. Aiden tells him that it's okay. "Lydia never believed I was one of the good guys anyway." Ethan laughs. Derek tells Aiden, "She'll believe me." Aiden coughs, and Ethan shushes him, trying to soothe his pain. He rocks him lightly, and Aiden dies. Lydia runs out of the school and sees them, then turns and rushes into Stiles's arms. 
- ↑ 1.0 1.1 1.2 "The Girl Who Knew Too Much"
- ↑ "Tattoo"
- ↑ "Chaos Rising"
- ↑ "Unleashed"
- ↑ "Frayed"
- ↑ "Currents"
- ↑ "The Overlooked"
- ↑ "Alpha Pact"
- ↑ "Lunar Ellipse"
- ↑ "More Bad Than Good"
- ↑ "Galvanize"
- ↑ "Illuminated"
- ↑ "Silverfinger"
- ↑ "Riddled"
- ↑ "Letharia Vulpina"
- ↑ "Echo House"
- ↑ "De-Void"
- ↑ "Insatiable"
- ↑ "The Divine Move"