Isaac Lahey

* Human
* Werewolf

**Isaac Lahey** was a supporting character in the second and third season of MTV's *Teen Wolf.* He first appeared in the Season 2 premiere episode *Omega*, where he was approached by Derek Hale, who had recently become an Alpha and was looking to build a pack. Isaac then consented to the Bite and successfully turned into a Beta Werewolf.

He continued to be a member of the Hale Pack throughout Season 2 and into the first half of Season 3, during which time they joined forces with Scott McCall and his friends against threats such as the Argent Hunters, the Kanima and its master, Alpha Pack, and the Darach, all of which caused death and destruction to their town.

However, some time after the deaths of his close friends and packmates Erica Reyes and Vernon Boyd, Isaac began drifting away from Derek and toward Scott, who had recently learned he had the potential to be a True Alpha and whose family took Isaac in as their ward after Derek, who had been his informal guardian after the death of his father, kicked him out of his loft in an effort to protect him from the Alpha Pack.

After Derek gave up his Alpha powers to save his sister Cora, Isaac, now without an Alpha, officially joined the McCall Pack as Scott's Beta and worked with his new pack to fight against the Nogitsune, who had recently possessed his friend and packmate Stiles Stilinski, as well as the Oni, who were hunting the Void Kitsune as well.

However, following the death of his girlfriend, Allison Argent, the devastated Isaac left Beacon Hills with Allison's father and Isaac's mentor, Chris Argent, and moved to France with him, where he continues to live now even despite Argent returning to their hometown to assist the pack in their fight against supernatural and human threats.

Isaac is a member of the **Lahey Family**, an honorary member of the **McCall Family**, and a former member of the **McCall Pack** and the **Hale Pack**.

## Early life

Very little is known about Isaac's early life. From what has been revealed by Isaac, he grew up with his father, mother, and older brother Camden. At some point, Isaac's mother died from unknown causes, followed shortly by Camden, who enlisted in the Army after graduation and was ultimately killed in action while on deployment in Afghanistan. *("Party Guessed")*

Following their deaths, Mr. Lahey went from being a loving family man to an incredibly abusive single father who put a lot of pressure on Isaac, his only surviving family member, to succeed. If Isaac disobeyed him or got poor grades in school, his father would often beat him before locking him in a freezer down in the basement for long periods of time, a punishment that would later cause Isaac to develop a severe case of claustrophobia (and, by extension, post-traumatic stress disorder and severe anxiety) which lead him to have panic attacks whenever he was forced into small spaces. *("Party Guessed")*, *("Unleashed")*

As a child, Isaac became close friends with Matt Daehler, with whom he bonded over their mutual love of comic books. Isaac's father was the coach of the Beacon Hills High School swim team and held many parties at their house where he would allow the team members to drink and swim in their pool.

One night during one of these parties, Matt was at the Lahey House to swap comic books with Isaac, where the two happened upon the party. One of the teammates threw young Matt into the pool even despite his frantic protests that he didn't know how to swim, and he nearly drowned while the rest of the people at the party, who were drunk and too busy hooking up with each other, ignored him. Finally, Mr. Lahey saved his life by pulling him out of the pool and performing CPR, but the older man blamed Matt's near-death-experience on him for not knowing how to swim before threatening him not to tell anyone what happened.

It was this event that eventually led Matt to become the Kanima master after lending the newly turned Kanima Jackson Whittemore his camera; the two ultimately bonded, and Matt's first act with Jackson under his control was against Mr. Lahey on the same night that the man had badly abused Isaac and unknowingly revealed Isaac's recent Werewolf transformation. When Mr. Lahey got out of his car to chase Isaac down after he fled from the house, Matt set the Kanima on him, who viciously tore him apart with his claws in retribution for almost letting Matt die all those years ago. This ultimately allowed Isaac to run away without harm. *("Fury")*, *("Shape Shifted")*

As a teenager, Isaac began working at the cemetery that his father owned, digging graves after school and at night to help out his family on top of going to school and playing on the lacrosse team. *("Omega")*

In February or March 2011, Isaac, desiring the power to defend himself from his abusive father, accepted Derek Hale's offer to bite him and transform him into a Werewolf, making him Derek's first true Beta (as his first bitten, Jackson Whittemore, seemed to initially reject the transformation and was then revealed to have become a Kanima instead of a Werewolf).

## Personality

Isaac's personality throughout his time on the series has evolved quite a bit since his introduction. At first, he was shown as a timid, shy young man whose abusive father caused him to be fearful of those around him. After Derek Hale gave him the Bite, however, Isaac took advantage of his new powers and enjoyed using them to dominate others, enjoying the feeling of being powerful instead of powerless for the first time in his life. However, after meeting Scott McCall and the members of what would eventually become the McCall Pack, Isaac eventually grew into a more selfless and compassionate person who was capable of having healthy relationships with others, especially after he was informally adopted by Melissa McCall and accepted into both the McCall Family and the Argent Family.

However, throughout all of this development, certain parts of Isaac's personality have stayed the same, such as his sarcastic sense of humor and his ability to hold grudges against those who have wronged him, as evidenced by his long-lasting disdain toward Ethan and Aiden for their involvement in the deaths of Vernon Boyd and Erica Reyes and the harm they had caused him and his friends.

As a result of the abuse he sustained from his father throughout his adolescence, Isaac developed a severe case of claustrophobia due to the many hours he was punished by being locked in a deep freezer in the basement, though he has been shown to overcome this phobia in life-or-death situations, such as when he prevented the root cellar ceiling from falling and crushing Allison, Chris, Melissa, and Sheriff Stilinski. This abuse also led him to develop a strong sense of self-preservation—when Scott, Boyd, and Ethan attempted to kill themselves due to Wolfsbane poisoning and manipulation from the Darach, Isaac simply hid under his bed until he could be snapped out of it by Stiles Stilinski.

Isaac also has a very blunt and honest personality that often causes him to respond to questions and statements in a harsh and/or tactless manner, such when he was questioned by Scott about his feelings for Allison Argent and accidentally blurted out that he wanted to kiss her. He also is a somewhat pessimistic person, as evidenced by his lack of optimism when the McCall Pack worked together with the intention of saving Malia Tate's life and forcing her to shift out of her full-coyote form and back into a human for the first time in eight years.

He also has a bit of an impulsive streak in him as well, as he has a tendency to want to fight first and ask questions later, indicating he has much in common with another Beta werewolf who joined the McCall Pack after he left, Liam Dunbar. Isaac also seems to be a bit of a Lothario, having shown romantic attraction to many other characters throughout his time on the series, including Lydia Martin, Erica Reyes, Allison Argent, and Cora Hale.

Despite the qualities he possesses that could be considered negative, Isaac has proven himself to be an incredibly loyal person, and is willing to put himself in harm's way in order to protect his loved ones, such as when he helped defend Derek against Kali despite Derek having recently kicked Isaac out of the house by abusing him in the same way as his father, or when he jumped into a fight with the Oni in order to protect Aiden despite his negative feelings toward the twins for their past actions.

## Physical Appearance

Isaac is a very tall and very handsome young man with a lean, muscular build. He has dark blond hair that is slightly curly, pale white skin, and large, deep-set blue eyes. At first, Isaac dressed like most young men his age in simple t-shirts and jeans, but after receiving the Bite, he started to dress in a more trendy fashion, favoring designer jeans, cardigans, v-necks in shades of white, blue, and black, and black leather jackets with boots. He is also notable for enjoying to wear trendy scarves, a quirk that often causes him to be teased by Stiles Stilinski.

## Powers and Abilities

Powers

**Beta** Werewolf **Physiology:** Isaac, as a Beta Werewolf, possesses the standard abilities of his species.

* **Super Strength**: As a Werewolf, Isaac possesses a superhuman level of strength that allows him to break through chains and deadbolt locks, punch through brick and marble walls, and throw grown men across a room with ease. Isaac's strength was bolstered even more by his membership in a pack, first in the Hale Pack and then again in the McCall Pack, allowing him to break humans like Allison Argent out of their handcuffs *("Alpha Pact")*, claw deep gashes into metal locker doors *("Venomous")*, snap an iron chain in half with his bare hands *("Insatiable")*, and even keep the roof of the Nemeton's root cellar from collapsing on him and the rest of the people inside. *("Lunar Ellipse")*
* **Super Speed**: As a Werewolf, Isaac is able to run much faster than even the most athletic human beings, both on two legs and by loping on all fours. Isaac is an exceptionally fast person, even for a Werewolf, due in part to his long legs, as he was able to run fast enough to stay ahead of then-Alpha Werewolf twins Ethan and Aiden while the two were chasing him through the Beacon Hills Preserve. *("Unleashed")*
* **Super Agility/Reflexes**: As a Werewolf, Isaac possesses supernaturally enhanced agility and reflexes, allowing him to jump across long distances, jump down from several stories high and land lightly on his feet, and perform a multitude of acrobatic and gymnastic feats. Like both of his Alphas, Isaac had an affinity for doing front-flips while jumping from tall heights and spinning kicks while he fought. He also uses his superhuman agility to also enhance his reflexes, as evidenced when he was able to catch a flying arrow just moments before it could hit Lydia Martin in the face and kill her. *("Anchors")*
* **Super Durability**: Though he is a Werewolf, Isaac can still receive open wounds like any other creature. However, his lycanthropy gives him a supernaturally-enhanced resistance to blunt force trauma, allowing him to be thrown through walls and fall from large heights without sustaining life-threatening injuries, such as when he and Braeden drove through a wall of plate-glass windows to escape from the twins. *("Tattoo")*
* **Super Senses**: As a Werewolf, Isaac, like his wolf counterpart, has supernaturally enhanced senses of sight, smell, and hearing, bestowing him with numerous abilities, including being able to: see in the dark and across much larger distances than a human; track scents for up to several miles and interpret the chemosignals that indicate identity and/or emotional states; and hear indoor conversations from outside of buildings with ease. Though Isaac was still learning how to track more complicated scents, he was very adept at using his enhanced hearing to eavesdrop on conversations and follow certain sounds, such as when Chris Argent used his ultra-sonic emitters to draw the Werewolves to where he, Sheriff Stilinski, and Melissa McCall were being held captive so they could be rescued. *("Lunar Ellipse")* Additionally, Isaac's glowing Werewolf eyes allow him to see mystical supernatural phenomena that ordinarily cannot be seen with human eyes, such as the Nemeton or a Kitsune's aura.
* **Accelerated Healing**: As a Werewolf, Isaac possesses an extraordinarily enhanced healing factor that allows him to recover from wounds exponentially faster than ordinary humans. Minor wounds such as cuts or broken bones can heal within moments, while more serious injuries such as gunshots, multiple organ trauma, broken spines, and burns can take hours or even days to heal. This is especially true when it comes to electricity, as after Isaac fell into a large puddle of water that surrounded a live electrical wire, Isaac was in the hospital for days recovering due to a Werewolf's vulnerability to electricity. *("Letharia Vulpina")*, *("De-Void")* Because of this accelerated healing ability, Isaac is immune to the majority of human illnesses and conditions and cannot get drunk on alcohol or high on recreational drugs due to his body healing too quickly, though very large doses of anesthetics have been shown to incapacitate him for short periods of time. *("Tattoo")*
	+ **Longevity**: Because Isaac's rapid cellular regeneration prevents him from contracting most human diseases and conditions and replaces his degenerating cells at a constant rate, he ages much more slowly than a normal human and is granted a greatly-extended lifespan. It is unknown what the average life expectancy of a Werewolf is, but the oldest known Werewolf, Satomi Ito, is 110+ years old with the appearance of a 50 to a 60-year-old woman, suggesting that werewolves if they are not killed, could potentially live decades longer than even that.
* **Shapeshifting**: As a Werewolf, Isaac possesses the ability to transform his features into a partially-lupine form, with glowing gold eyes, retractable claws and fangs, a ridged brow, pointed ears and large sideburns. Isaac is also able to selectively transform a single feature at a time, such as only making his eyes glow to enhance his vision, or extending his claws to use them to cut something.
* **Pain Absorption**: As a Werewolf, Isaac possessed the ability to take the pain of animals, humans, and other supernatural creatures through tactile contact. This is usually done by either holding hands with the pained individual or by touching the injured body part with their hand and drawing the pain into themselves, which manifests through darkened veins that begin in the fingers and work their way up the arm toward the chest. Isaac was shown using this ability on one occasion to take pain from a dog who was dying of cancer. *("Fury")*
* **Animal Instincts**: Isaac, as a Werewolf, is an apex predator like his wolf counterpart, and as a result, he can think as wolves do and behave in the way that a wolf would in the wild. This allows him to assert dominance over weaker creatures such as dogs, cats, and deer, and can force them to calm down or run away if they are acting aggressively. This also aids Isaac in tracking others by tapping into his wolf hunting instincts.

### Abilities

* **Strategic Thinking**: Even before becoming a Werewolf, Isaac has possessed an ability to think strategically, which he has said he learned from his father. This was proven when he helped Allison figure out how to decipher the clues in her father's study in order to learn what he knew about the Darach and her sacrifices. *("The Girl Who Knew Too Much")* He has also used this ability on numerous occasions to aid the packs, both before battles and when reacting to new information, and has a special affinity for stepping back and seeing the bigger picture rather than focusing on the details.
* **Self-Preservation**: Isaac, as a result of his abusive upbringing, has a highly developed sense of survival instincts, which has helped him avoid death on many occasions. This was first proven when the wolfsbane poisoning inflicted on him, Scott, Boyd, and Ethan caused them all to hallucinate their worst fears; while the others were trying to kill themselves out of the horror of what they were seeing, Isaac simply hid under his bed and tried to ride it out until the humans, Allison, Lydia, and Stiles figured out a way to break them out of their wolfsbane haze. *("Motel California")*

## Weaknesses

Isaac possesses the common weaknesses of a Werewolf, along with other weaknesses that are specific to Isaac himself.

* **Wolfsbane**: Depending on the strain of wolfsbane and the method of exposure, Isaac, as a Werewolf, is extremely vulnerable. Inhaling purple wolfsbane has been shown to cause him vivid and terrifying hallucinations while being harmed by weapons coated in the wolfsbane can poison him and prevent him from healing. Nordic Blue Monkshood is fatal to Werewolves, as evidenced by the fact that an Argent Hunter planned to inject Isaac with it to kill him shortly after he was turned into a Werewolf *("Omega")*, and yellow wolfsbane has been shown to weaken, sedate, or even kill Werewolves as well, depending on the method of exposure and the potency.
* **Electricity**: Electricity is another weakness of Werewolves that can have varying effects on them depending on how strong the voltage is. Lower amounts of electrical exposure can disable their ability to heal and shapeshift, while higher amounts can stop their heart or kill them outright. When Isaac accidentally stepped into a puddle in which a live wire had fallen, he was electrocuted so badly that he was knocked unconscious and fell into the puddle, causing electrical burns on the entire side of his body that made contact with the water. He was injured so badly by this event that he had to stay in the intensive care unit of the hospital for several days until his healing was finally able to kick in and help him recover. *("Letharia Vulpina")*, *("De-Void")*
* **Letharia Vulpina**: Also called "wolf lichen," letharia vulpina is a kind of moss that has been used for centuries as a poison to kill wolves, coyotes, and foxes. As a result, it can also be used to weaken Werewolves, Werecoyote, and Kitsune, though it isn't fatal to them.
* **Modified Canine Distemper Virus**: Created by The Chemist, the modified canine distemper virus was specifically created to target and kill canine shapeshifters such as Werewolves, Werecoyotes, and Kitsune in order to reap the bounties of those shapeshifters in the Deadpool. Once exposed, Kitsune will suffer neurological symptoms, whereas Werewolves like Isaac and Werecoyotes will begin to suffer flu-like symptoms such as fevers and aches, followed by an inability to control their transformation, either involuntarily shifting into their were-creature form or being unable to do so despite their best efforts. Those infected will then begin to bleed black blood from their nose, ears, mouth, and nail beds before they lose their eyesight, at which point they will die within minutes. However, this disease can be both cured and inoculated against by ingesting wild purple reishi mushrooms.
* **Full Moon**: Because Werewolves' powers are derived from the moon, a full moon will be when they are at the height of their strength, though this comes at a cost-- during this lunar phase, a Werewolf will become more rabid and bloodthirsty, forcing them to learn to control this impulse in order to prevent their supernatural identities from being exposed to the human population. Though Isaac has had control over this transformation since his second full moon as a Werewolf *("Party Guessed")*, it still takes him a great deal of focus and concentration to maintain it, and even the most well-disciplined lycanthrope can lose control under the right circumstances during the full moon.
* **Lunar Eclipse**: Just as the full moon marks the height of a Werewolf's powers, the lunar eclipse-- specifically, the time frame when the moon is in the Earth's umbral shadow-- is the opposite. Because the moon is completely hidden by the Earth's shadow during this time period, a Werewolf will completely lose all their powers (including super strength, healing, and shapeshifting) for the duration, which is usually between ten and twenty minutes long. Isaac experienced this vulnerability when this phase of the lunar eclipse began while he was in the middle of holding up the roof of the root cellar under the Nemeton to prevent himself and the other people with him from being crushed under its weight. As a result of the loss of his enhanced strength, Allison, Argent, Stilinski, and Melissa had to help him hold the roof up until Stiles arrived with a metal baseball bat to help act as a brace for the roof. *("Lunar Ellipse")*
* **Intense Emotions**: Because a Werewolf's transformation is often tied to their heart rate, any intense emotion that can increase their pulse (such as anger, fear, or lust/arousal) can cause them to lose control and shift involuntarily if they do not have the training necessary to keep themselves in check. Like with the full moon, Isaac has had control over his transformation for some time now, but it takes a great deal of focus and concentration to maintain this control under stressful situations, and under the right circumstances, he can lose control and possibly hurt others. This was demonstrated when Isaac suffered a panic attack after Ethan and Aiden locked him in a supply closet at school that caused him to involuntarily shift into Werewolf form and attack Allison Argent. *("Unleashed")*
	+ **Claustrophobia**: Due to the horrendous abuse Isaac suffered at the hands of his father, which involved him being locked in a freezer as punishment for even the slightest infractions, Isaac has a severe case of claustrophobia that is triggered whenever he is forced into a small space against his will. Though he has demonstrated that he can push past this phobia in life-or-death situations (as evidenced when he used his superhuman strength to hold up the Nemeton's root cellar after it collapsed due to Jennifer Blake's thunderstorm) *("Lunar Ellipse")*, it can also lead him to lose control over his transformation, as discussed above.
* **Mountain Ash**: Like any truly supernatural creature, Isaac is vulnerable to rowan wood and its burned form, mountain ash, which can be used to create barriers that he can neither touch nor cross. As a result, it can be used to prevent him from entering an area that is warded with it, and he can also be trapped within unbroken circles of it as well.

## Trivia

* After the Season 3, Isaac completely disappeared from the show due to Daniel Sharman's decision to join the cast of The CW network's series *The Originals*; however, according to Jeff Davis, he went to France with Chris Argent at the end of *The Divine Move* and decided to stay there even after Argent returned to Beacon Hills.
* Isaac's patient identification number at Beacon Hills Memorial Hospital is #556599, according to the chart seen in Season 3B's *De-Void*.

## Relationships

* Isaac and Mr. Lahey (Father/Son)
* Derek and Isaac (Formerly Alpha-Beta, Friends/Allies)
* Erica and Isaac (Former Packmates, Friends)
* Boyd and Isaac (Former Packmates, Friends)
* Cora and Isaac (Former Packmates, Friends)
* Isaac and Scott (Alpha-Beta, Close Friends, Formerly Foster Brothers)
* Isaac and Stiles (Packmates, Antagonistic Friendship)
* Isaac and Lydia (Packmates, Friends/Allies)
* Allison and Isaac (Former Enemies, Romantic Relationship)
* Isaac and Melissa (Foster Mother/Son)
* Chris and Isaac (Allies, Guardian-Ward)
* Isaac and Kira (Packmates, Friends/Allies)
* Allison, Isaac and Scott (Trio Friendship, Love Triangle)
* Isaac, Scott and Stiles (Trio Friendship)
* Allison, Chris and Isaac (Trio Friendship, Familial Relationship)
* Isaac, Melissa and Scott (Trio Friendship, Familial Relationship)
* Aiden, Ethan and Isaac (Trio Relationship, Frenemies)
* Boyd, Erica and Isaac (Trio Relationship, Former Packmates)