In Muted, Liam is covering the goal during lacrosse practice, he's very skilled at the game and therefore isn't letting anything get past him. After they finish up, Garrett congratulates him and tells Liam that he might be the team's first ever freshman team captain. While in the locker room, he is confronted by Stiles Stilinski and Scott McCall about his performance on the field. Liam has no idea what they mean, he explains that he recently transferred from Devenford Prep, Scott says that he was really kicked out and Liam admits that this is true. Liam tells them that he learned to play lacrosse from his stepfather who made team captain as a Sophomore, like Scott.
As he prepares for try-out after school, he overhears Coach tell Scott that his spot for team captain is up for grabs, Liam is pleased by this news. Liam is doing extremely well during the try-outs, he does better than most which leads Stiles to suggest that he's some type of supernatural creature such as a "Werecheetah". Liam is forced to go up against Scott and Stiles as they cover goal, Liam manages to maneuver past both of them. After seeing what has just occurred, Malia Tate gets up in the stands demands a do-over, she puts $10 on Scott and Stiles, Coach excepts her offer and tells Liam to go again. Liam heads towards the goal again but this time he isn't so lucky, Scott and Stiles take him down; however, he gets severely injured in the process, so the boys offer to take him to the nurse.
Liam's injury is worse than they though and he is taken to Beacon Hills Memorial Hospital where Melissa McCall puts him in a wheel chair and they leave. Liam's leg is being examined by his stepfather, he explains that they'll need an x-ray to determine the injury. Liam feels as if the accident was his fault for going up against two juniors, Dr. Geyer reminds him to play smart not hard, he's worried that he has disappointed his stepfather but his is not the case. Liam hears Nurse McCall scream, he goes out into the hall to see that it is deserted, moments later he is grabbed by Sean Walcott. Liam is taken to the room by Sean and held in a choke hold, Scott soon arrives on the roof and pleads with Sean to stop, Liam manages to break free but is thrown off the roof by Sean. He holds on to the edge of the roof as he dangles above the ground, Scott grabs Liam's arm but as he loses his grip, he is forced by bite Liam in order to prevent him from falling, Scott then manages to pull Liam to safety.
In The Benefactor (Episode), after being bitten by Scott, he is taken to the McCall House, duct taped and left in the bath tub. Scott and Stiles get him out the bathroom and take the tape from around his mouth, so they can talk. Scott tries to explain the situation to Liam, he had to bite him in order to save his life, Scott further explains that his life is about to change, but Stiles reminds Scott that Liam could die. He then begins to cry, Scott unties Liam who then grabs a chair and hits Scott with it and punches Stiles in the face. He leaves the room only to make it to the hall, Scott and Stiles tackle him down the steps; however, Liam makes it to his feet before them and manages to escape.
He arrives to school the next morning completely out of breathe, he has a bloody bandage on his arm from where Scott bit him. His best friend Mason Hewitt asks why he wasn't on the bus, Liam says that he ran to school from his house which is three miles away. He then becomes dizzy and notices Scott watching him from across the school yard so he runs inside. Once inside, he is cornered by Scott and Stiles, they attempt to explain the situation to him, Scott says "we're brothers now" and "the bite is a gift". Liam is confused, Scott says something big is going to happen, Liam explains that nothing is happening to him, he rips of the bandage to show that he is completely healed.
In the hall he sees Kira Yukimura coming down the stairs, Liam is very attracted to her, as she reaches the final step, Kira trips and falls on her face. He rushes over to help, when he does, Kira invites him to a party at Lydia's Lake House. That night, Liam is being driven to the party by Kira, the moon is full, his hearing sensitivity increases. He then receives a text from Mason asking where he is at, Liam tells Mason about the party. As they arrive Liam begins breathing heavily, he's becomes suspicious as to why there aren't more people, once he enters the house, Stiles tells him its an intervention.
He has been filled in on their supernatural status, to Scott he says werewolf, to Malia he says werecoyote, to Lydia he says banshee and to Kira he says fox, Kira says the correct term is kitsune. He looks to Stiles wondering what he is, Stiles saya that "for a little while I was possessed by an evil spirit. It was very evil". Liam says what are you now, and Stiles says "better". He notices the chains on the table wondering if those are for him, Malia says they are for her and she makes her eyes glow blue. He is taken back and demands to know how she did that, Scott says he'll learn after he gets through this first full moon.
Liam starts to feel the effects of the moon, he calls all of them crazy, as time goes on he continues to get angrier, at this moment, Mason along with several other people pull up to the house. Liam admits to telling Mason about the party. Liam starts to shift, scratching the wooden floors, Lydia tries to stop him but he growls at her showing off his fangs and golden eyes. Kira and Scott take him to a small metal boat house, they try to chain him t one of the support beams but he breaks free and attacks Scott, as he is on Scott, Kira knocks him out with a paddle. While knocked out, they chain him to the support beam, he soon wakes up, breaks free of the chains and leaps out the window into the woods.
Scott follows as Liam runs throughout the woods, he manages to get behind Scott and pin him to a tree, Liam yells that its all Scott's fault. He goes in to attack but is blinded by one of Chris Argent's Flash bolt arrows, Liam quickly takes off. He finds himself trapped by several of Argent's ultrasonic emitters, Scott turns them off when he sees Liam on his knees in pain. He explains that his parents can never find out what he is, the way his parents looked at him when they learned he trashed his teacher's car, they look at him as if he was a monster. Scott informs Liam that he's not a monster, he's a werewolf.
In I.E.D., Liam and Mason are working out in the weight room, Liam is bench pressing 180 pounds, Mason tells him about how he allowed Garrett to use his hoodie but it was never returned. As Mason continues to talk, Liam adds more weight, Mason then accuses him of acting strangely, Liam doesn't care and he adds on even more weight which leads Mason to ask if he's on steroids. Mason wonders if this has anything to do with the upcoming lacrosse game, Liam initially says no but he then learns that they will be playing his old school, Devenford Prep. He becomes enraged, enters the locker room in search for his lacrosse stick and discovers that Derek Hale has it, he snaps the stick in half. Liam instinctively attacks; however, he is no match for Derek who slams him against the locker with one hand.
He snarls and bites at Derek until he hears Scott calling his name in which he calms down. He is released, Scott hands him his lacrosse stick, explaining that the one Derek broke was not his, the bell ring and Scott tells Liam to get to class. Later that school day, Liam approaches the Devenford Prep bus, he calls out to a guy named Brett Talbot and extends his hands saying have a good game. Brett laughs, he says their team is going to break Liam in half for what he did to their coach's car, once again Liam begins to lose control, clutching his hand so intensely that blood begins to drip between his knuckles. Scott and Stiles grab Liam and take him to the showers in the boys locker room where he eventually calms down.
Liam explains to them that the car he destroyed belonged to his coach, he did it after being benched for an entire season. His anger was so out of control he had to be sent to a psychologist who diagnosed him with I.E.D. He says that he's suppose to take a medication called Risperdal but he refuses to because it makes him too tired and prevents him from playing lacrosse. Scott suggests that Liam sit this game out but he refuses, they explain to him that one of the assassins is likely on the lacrosse team and that same person is the one who ordered the keg at Lydia's party. Liam doesn't know who ordered the keg but he knows that Garrett paid for it.
That night at the game, Liam is talking with Mason, he believes that he can take Brett even though he's a foot taller than him, Mason agrees, he goes to to say once Liam takes Brett, he should pass him to Mason, they both laugh. While preparing for the game, a player of the rival team whips a ball at Liam's head but he manages to snatch it out of the air. During the game he is gunned at by the rival team, Brett sneaks up at flips Liam, they both hit the ground, Liam breaks his arm, Scott fixes it. Then they hear the sound of a sharp blade retracting, Scott checks Liam for any scratches but he doesn't have any.
In Orphaned, Liam comes around the corner with a concerned look on his face, he sees Scott talking to his father. Liam is worried that his name might end up on the Dead Pool, Liam is given the task as look out while Scott breaks into Garrett's locker, Scott tells him that nothing was in it. The next morning, he and Mason are out for a run, Mason expresses his feeling towards being used by two assassins, he's just as surprised that Liam isn't freaking out as well. Liam assures Mason that he's also freaked out by the situation, he begins to speed up and eventually loses Mason. Once he realizes that Mason is far behind, Liam turns around to look for him but is immediately rammed by Garrett's truck and stabbed by Garrett's dagger.
Liam finds himself down in a deep well, Liam has been stabbed with the yellow wolfsbane, once it moves to the heart, bad things happen. Liam yells for help while in the well; however, he is in the middle of the woods where no one can hear him. He tries to escape the well by climbing out but the rocks are slippery, he only makes it half way up before falling back down, he then begins to remember a conversation he had with Scott at Lydia's Lake House. Scott explains that Liam broke the chains and jumped through a window but the cuts he suffered from healed while he was a werewolf. Liam says that's one good thing about being a wolf, Scott tells him that this could be bad for someone else, he tells Liam that he must get in control of it.
He explains that he's been trying to for years, his stepdad told him that "when kids get angry, they deal with it in one of two ways. They either hurt themselves or they hurt someone else." He then begins to climb back up the rocks again, he looks up at the moon shinning down on him, Liam then roars incredibly loud. Liam begins to lose his, after a while he can't hold on anymore, just as he falls back, Scott grabs his hand and saves him. He is taken to the Beacon Hills Animal Clinic so that Deaton can cut open his chest and cure Liam of his wolfsbane poisoning.
In Time of Death, Liam, Scott, Stiles and Kira are all at Scott's house constructing a plan to take down The Benefactor. Stiles says that the plan is dangerous, hearing this, Scott offers Liam an out, he says that he doesn't have to do it but Liam refuses saying he isn't scared. Earlier that day Liam, Scott, Kira and Noshiko Yukimura were in Scott's room surrounding his bed, Liam is uneasy about the entire situation, Scott assures him that everything will be okay. He asks Noshiko if she'd one it before, she replies that she's seen it done before, he watches as Kira uses her powers to stop Scott's heart. In the present, Liam, Stiles, Kira, Noshiko and Melissa gather around Scott's body.
While Scott is unconscious, Liam appears in several of his dreams, in the first dream he throws Scott a lacrosse ball yelling catch, saying that's why you're the team captain, he then jogs down the halls of Beacon Hills High School. Scott is reading his own Dead Pool and says I can't kill them but Liam explains that he has to because he's the alpha and a predator. He is then stabbed in the back by The Mute twice as he pleads for Scott to help. As they watch from the laptops for The Benefators arrival, the camera on the roof goes out so Liam and Kira go to investigate. During Scott's second dream, Liam throws him the ball again, only thing times Scott catches it with his claws and Liam says "That's why you're the Alpha."
They both suddenly appear in the locker room, Scott is examining his fangs, he says their different, Liam believes this could be due to Scott becoming more of a werewolf, maybe it means he's becoming stronger then he is once again stabbed in the back by The Mute. On the roof, a transfomrer begins to spark, Liam believes that it was done intentionally, they turn around as see a Berserker headed their way. Liam lunges at the Berserker but he is no match and thrown, Kira is knocked out soon after, Liam attempts to wake her up, he gets Kira back to her feet and they retreat. Kira tells him to run but Liam refuses, he gets on top of the transformer and jumps at the Berserker. In the final dream, Liam yells catch but this time its a bloody tomahawk and Liam is lying at Scott's feet, bleeding, with The Mute's assistance, Scott kills Liam with the tomahawk. After facing the Berserker, Liam runs into the morgue and says Kira's mom is hurt.
In Perishable, Liam is in his room trying to go to sleep when his printer cuts on and begins spitting out the Dead Pool list, after failing in trying to stop the printer, he just unplugs it. After facing the Berserker on the rooftop, Liam has become very paranoid, a she walks throughout the halls of Beacon Hills High School, he thinks that everyone is talking about him and laughing. Moments later, he catches a quick glimpse of a Berserker; however, this is just a hallucination. Mason appears, he wants to know if Liam is going to the bonfire, he says no but Mason reminds him that its mandatory because he's on the lacrosse team. Still seeing the Berserker, agrees to go and then he runs off.
In the locker room , he appears to be distracted as Coach lectures them, he gets up and leaves. Scott finds him sitting on the steps, Liam explains that he's scared and how his printer kept going off the previous night, at that moment, Coach yells as his printer begins spitting out the Dead Pool list. He and Scott pick up the list off the ground, they notices that Derek's name is no longer on the list and Liam is no longer worth $3 million but $18 million now. Liam and Mason show up to the bonfire, Liam is at a picnic table pouring alcohol into a bottle, he wonders why Mason isn't stopping him. Mason replies that he wants Liam to get so drunk that when he asks his best friend what's going on, he'll be too out of it to lie.
As Liam continues to drink, he starts to stumble and sway which should be impossible for a werewolf, Scott asks Mason how much has Liam had to drink, he replies not enough to get Liam the way he is, Scott tells Mason to watch Liam as he goes to check out the cause of their illness. Two men dressed in security outfits comes and take Liam, Malia and Scott, they are thrown in the hallway and covered in gasoline. However; before they can be set ablaze, Mason, Derek and Braeden manage to stop the assassins.
In Monstrous, Liam is at Scott's house waiting for Scott, he hands Liam a helmet telling him that they found Brett and the rest of Satomi's Pack. Liam hesitates, he explains to Scott that he's not like him, he asks Scott how are all of them still alive, Scott says all of them aren't and he offers to take Liam home.
In A Promise to the Dead, he and Mason and playing video games in his room, Liam is winning, Mason wonders if he's been practicing or suddenly acquired super-human reflexes. Mason prepares to leave as he has to study for a test. Liam begs for him to stay and play "one more game" but Mason has already played "one more game, four times". Liam offers Mason to study at his house and spend the night, realizing something is wrong, he asks Liam if he's okay, Liam tells Mason that he can leave. As Liam lies in his bed, he begins to hear growling and thumping, he's imagining a Berserker in his room coming towards him, Liam repeats you're not there over and over until he eventually turns on the lights and sees no Berserker. He is with Mason in the weight room preparing to bench press 300lb, Mason offers to spot him but Liam adamantly refuses his help twice.
As he starts to lift, Liam begins to have flashes of that altercation with the berserker on the rooftop while at the same time losing his powers, the bar drops on his chest leaving Liam no way to breath, Scott shows up removes the bar and tells Liam that its fine if he doesn't want to be with them but don't push his friends away. Mason shows up in Liam's bedroom, he throws some games on the bed, telling Liam that he's aware that Liam is going through some things and that he isn't ready to share that but Mason will be waiting for the moment that he's read. Until then, Mason says there's got to be at least one game he can beat Liam in, he picks up a game and says that he's never played this one.
In Smoke and Mirrors, Liam is at Scott's house, Stiles and Malia come down from Scott's room, Stiles tells Liam to go home but he refuse. Stiles explains that he doesn't have to come but Liam insists on it. Stiles reminds him that he tore through the last set of chains and they would have to freeze him in carbonite to get him down there. Unaware of Stiles' sarcasm, Liam agrees and asks where can they get it, either that or they have to come up with a better way. They all meet up and prepare to retrieve Scott from Mexico but Lydia hasn't shown up yet, Liam offers to call Mason and tell him to check for Lydia at the school.
Before they leave Peter Hale encourages them to remember that the berserkers are not human, they are pure animal and instinct. As Peter talks about them Liam becomes fearful, Peter can sense this and explains to Liam that its that fear that keep him alive. He then calls Mason who tells Liam that Lydia's car is at the school, he wants Mason to call him as soon as he finds Lydia. As they drive through the desert, Derek is chaining Liam up in the back of the prisoner transport van. Derek then gives him the Triskelion, telling Liam that its a "very powerful supernatural talisman", he says they use it to teach young Betas control during the full moon.
He begins to feel the effects of the full moon, Derek attempts to calm him down, he explains to Liam what the three spirals mean to his family, it means Alpha, Beta, Omega, just like the tattoo on his back. It reminds Derek that a Beta can become an Alpha but an Alpha can also become a Beta, Liam wonders if an Alpha can become an Omega and Derek says yes. Derek further explains to Liam that Alpha, Beta, Omega is the family mantra, they repeat it over and over, each time gaining more control, Liam tries to but it fails. He then shakes the truck, breaks one of the handcuffs and tries to claw at Derek. He then breaks the other cuff and tries to attack Derek, with the Hale mantra not working, Stiles offers another, he asks Liam "What three things cannot long be hidden?", Liam says "The sun, the moon, the truth", this mantra proves effective and he regains control.
Derek asks if he can maintain that power once they reach Mexico, Liam flicks his claws, demonstrating that he has control. They enter the temple in search for Scott but Liam, Peter and Malia are attacked by a berserker, they all attack the berseker, working together as a real wolf pack would in order to take down a bigger prey. They eventually gain the upper hand, he and Peter hold the berserker back as Malia goes in for the killing blow with the bone dagger but Kira stops them and informs all of them that the berserker is Scott. Liam realizes that this is the truth when he looks into its eyes, but that heitattion is what led Scott to break free and choke Liam up against a wall, Liam pleads with Scott to stop, he says "you’re not a monster. You’re a werewolf, like me."
This registers to Scott and he regains control. Scott rips of the berserker clothing and accuses Peter of helping Kate Argent, then he watched as Scott and Peter fought. Scott is receiving the worst of the fight, Liam steps forward as if he is going to jump in so Peter throws an old church chair at him, this triggers something in Scott and he comes to the defense of his Beta. The next morning, they return to Beacon Hills, at school they try to explain to Coach why they missed the practice, Liam explain that Kira and Scott got stuck in mexico, so he and Stiles went to go and get them. Coach doesn't believe them but he moves on, he tells Scott and Stiles that Liam is their responsibility and that he's the best talent the coach has seen in years.