Haley Webb as Jennifer Blake -Druid(Darach)-
Jennifer Blake was the English teacher at Beacon Hills High School. Jennifer was the Darach and one of the main antagonists of Season 3. In “Tattoo”, Jennifer starts her class with the last quote from Joseph Conrad’s “Heart of Darkness”. Suddenly, flocks of birds mysteriously come flying through the window and begin attacking the class. She is seen mildly distressed afterward. In “Fireflies”, she’s seen late at school grading papers, when she happens across a feral Boyd and Cora, but she is saved by Derek who endures their attacks until the sun rises. Derek helps her up and she supposedly takes a liking to him. She sees Derek again in “Unleashed”, where she says she’ll say nothing about what she saw. Derek says he was going to see if she was okay and they connect. When Derek comes to her for help, after being wounded by Deucalion’s Alpha pack, she takes him to his loft in “Motel California” and tries to help him heal. Jennifer and Derek connect again with him saying she shouldn’t get involved with him, because everyone around him gets hurt, but she says she’s been hurt before. They share a kiss and spend the night together, which helps Derek heal faster. When the Alphas attack his loft in “Currents”, Kali has the twins hold her hostage as leverage against Derek and she witnesses Derek, in his Alpha werewolf form, and Kali fight. She is saved by Isaac but Kali has Derek kill Boyd.
In the episode “The Girl Who Knew Too Much”, Jennifer is taking a class and sees Lydia drawing a tree. Later, she organizes the recital to honor the dead. Sheriff Stilinski simultaneously uncovers an old case about a patient who was brought to Beacon Hills Memorial years ago, but birds, similarly to the events in “Tattoo” died that day with Stilinski realizing the birds were sacrificing themselves for the girl – who he figures out to actually be Jennifer. She is realized to be the Darach, the corrupted druid responsible for the mass sacrifices in Beacon Hills and tries to kill Lydia and kidnaps Stilinski. Using mistletoe Scott and Stiles prove to Derek she is the Darach in the episode “The Overlooked”, by exposing her true form. Derek angrily attacks her, but she reveals she’s poisoned his sister Cora with the same plant and only she can heal her. As the Alpha pack try to kill her, she shows her intense hatred for them. She reveals to Derek her first name was Julia Baccari and she was Kali’s Emissary. She and Kali were close, but Kali had attempted to kill her, as part of killing her entire Pack in order to join the Alpha pack. She was able to survive because Kali couldn’t bring herself to deliver the killing blow. Julia then struggled to the Nemeton, which hadn’t had power for a long time. But the sacrifice of a virgin months earlier had given the tree stump a spark of power again, which gave Julia the ability to survive just long enough until help arrived. Eventually, because Kali’s attack had left Julia hideously disfigured, she used her talents to disguise herself with a new identity, ‘Jennifer Blake’. She informs him of her plan to destroy Deucalion’s Alpha Pack on the next full moon which is also a lunar eclipse because werewolves lose all their power during the eclipse. Derek affirms this. She also tells him the virgin sacrificed at the Nemeton that reignited its power was Paige Krasikeva, his first love when Derek mercy-killed her, explaining her felt connection towards him. In “Alpha Pact”, Jennifer holds Stiles’ father, along with Scott’s mother and Allison’s father for the final sacrifice, Guardians, as they are all Guardians of their children. The behavior of the animals throughout the season is later discovered to have been caused by Jennifer in response to her and her mass sacrifices. She is also discovered to be aligned with the telluric currents as she committed her sacrifices in line with them. She’s holding the captive parents at the Nemeton, the same tree in Lydia’s been consistently drawing which is why Jennifer tried to kill her.
In “Lunar Ellipse”, Jennifer appears at Derek’s loft, breaking through the glass roof and takes on the Alpha Pack. She overpowers Kali and the twins. She angrily faces Kali, asking her what it takes for to look normal to spite Kali as she’d physically ruined her actual face. Jennifer demonstrates her power using telekinesis to have the glass shards rise and suspend. Kali stubbornly rages at her former friend and Jennifer ferociously rockets the glass shards into Kali’s body, killing her former Alpha. The twins then take her on in their merged form but she snaps their neck inducing them into a coma. She uses Lydia to lure Derek back to his loft. She promises Derek the kidnapped parents if he will be her “Guardian”, even after he informs her he’s no longer an Alpha werewolf. Jennifer begins sacrificing the parents using the storm to bury them alive with her connection to the telluric currents. At the abandoned distillery outside of Beacon Hills, they face off against Deucalion who has Scott with him. Deucalion easily overpowers both of them, but, to buy more time, Scott blinds the “Demon Wolf” long enough for the lunar eclipse to arrive and the werewolves are rendered powerless. Jennifer assumes her true form and thrashes Deucalion. Derek convinces her to heal his blindness so he can see the results of his actions on her with the intent of him repenting her. However, this leaves Jennifer weakened as Derek had intended. Enraged, Jennifer repeatedly assaults Derek, but he endures her attacks just long enough for the lunar eclipse to pass. The lunar eclipse passes, but Jennifer protects herself with a mountain ash barrier, now fully intent on sacrificing the parents. To save them, Scott determinedly pushes through her barrier and eventually breaks it becoming a True Alpha. Scott says he’ll kill her himself if she doesn’t stop the storm, but Deucalion does it mortally wounding her. Jennifer survived Deucalion’s slash to the throat, and was hoping the Nemeton would restore her health once more – only to be stopped by Peter Hale. After revealing she knows all about his plan (killing Scott to steal his new Alpha status), he slashes her throat himself, killing her for real. In an interview with Jeff Davis, it has been hinted that she may return in a later season.
Jennifer was highly intelligent, specializing in literature and mythology, as expected of a druid Emissary. She had an intense hatred for Deucalion’s Alpha pack, specifically Kali as she was friends with her and Kali tried to kill her and she stopped at nothing to get revenge on them, to the point of sacrificing innocent people. As the Darach, Jennifer was amongst the most powerful beings seen in the series because of her mass druid sacrifices. By massacring Warriors, she gained enhanced strength, Healers for healing abilities so great she healed Deucalion’s blindness, Philosophers for intelligence and strategy, and Virgins, supposedly to seduce people easily for her agenda as with Derek. She could use telekinesis, a form of mind control to have a pianist killed by a split random cord off the piano to slit her throat for her final Philosopher sacrifice, she could appear somewhere else partially or teleport completely as seen when Lydia saw her materialize in a blaze in “Motel California” and when she abducted victims. Overall, her most impressive talent was the ability to glamor herself to disguise herself and hide in plain sight so efficiently she settled into her “Jennifer Blake” persona for the majority of the time fooling many people she was a harmless, innocent woman.