In Beacon Hills, Scott McCall, a teenage werewolf, navigates the dangerous supernatural world alongside his best friend Stiles Stilinski, who is human but fiercely loyal, and his werewolf pack, including Derek Hale, a powerful werewolf seeking to protect his kind. This season, Scott grapples with becoming a True Alpha, a rare werewolf who achieves his power through his own strength and morality, while facing threats from both human hunters and supernatural entities.

The season's central conflict revolves around a mysterious entity known as the Darach, who performs ritualistic sacrifices to gain power. This threat escalates as the Alpha pack, led by the formidable Deucalion, manipulates events to their advantage, often targeting Scott and his friends. Key turning points include the revelation that Jennifer Blake is the Darach, and the emergence of the Nogitsune, a malevolent spirit that possesses Stiles, turning him into a dangerous puppet. The season is marked by significant losses, including the deaths of Boyd, Kali, and most tragically, Allison Argent, Scott's first love, who is killed by an Oni.

The season concludes with Scott and his pack defeating the Nogitsune, trapping its essence. While Stiles is freed from possession, the victory comes at a heavy price, leaving the survivors to cope with the profound grief and the lingering consequences of the supernatural battles they've endured.

Season 3 of Teen Wolf covers episodes 1-24. Here's everything that happened:

Season 3, Episode 1: Tattoo - Isaac is rescued by a mysterious woman from the Alpha Pack, who are after Scott. Scott gets a tattoo to reward himself for not contacting Allison, but it heals instantly. Derek helps make the tattoo permanent. The woman who saved Isaac is killed by Deucalion, who reveals his plan to use Derek to eliminate Scott.

Season 3, Episode 2: Chaos Rising - Stiles's childhood friend disappears after her birthday party. Isaac's memories reveal Erica's dead body and Boyd's location. Scott and Derek find Boyd and Cora locked in a vault, but they're bloodthirsty due to being kept from the full moon. Allison breaks the mountain ash seal, releasing Boyd and Cora.

Season 3, Episode 3: Fireflies - Scott, Derek, and Isaac hunt Boyd and Cora, seeking help from Chris Argent. Stiles investigates murders, discovering the victims were virgins. The werewolves are lured into the school, where Derek fights them to protect Ms. Blake. Stiles theorizes the killings are sacrifices, as another body is found. The episode concludes with Derek offering Ms. Blake his hand.

Season 3, Episode 4: Unleashed - Scott tries to stop a confrontation as Stiles defends werewolves. Bullet's owner is found murdered, mirroring previous sacrifices. Derek is attacked by the Alphas, and Deucalion tempts him to join their pack by killing his own Betas. Realizing this, Derek kicks Isaac out to protect him. Isaac then moves in with Scott and Melissa.

Season 3, Episode 5: Frayed - Riddled with flashbacks, the episode sees Scott and his friends on a cross-country trip where Scott is injured and Stiles is worried. Deucalion arrives at Deaton's clinic and kills the weakened Alpha, Ennis. Allison helps a wounded Scott on the bus. Derek, injured from a fall, seeks help from Jennifer Blake.

Season 3, Episode 6: Motel California - The cross-country team stays at a motel with a dark history, inducing hallucinations of past traumas due to wolfsbane poisoning. Scott, Isaac, and Ethan are driven to near suicide, while Boyd nearly drowns himself. Stiles and Lydia discover the motel's suicide count and the wolfsbane poisoning, saving Boyd and Ethan. Scott, fueled by hallucinations, attempts to set himself on fire, but Stiles stops him. The episode concludes with the team leaving the motel, realizing they were targeted, and Deucalion appears to threaten Scott's mother.

Season 3, Episode 7: Currents - Scott's mentor Deaton is targeted by the Darach, while Derek faces the Alpha pack. A trap set for the Alphas backfires, leading to Boyd's tragic death at the hands of Kali and the twins. Allison uncovers a map revealing the Darach's sacrifice locations. The episode concludes with Deaton revealing that Scott is a True Alpha.

Season 3, Episode 8: Visionary - Scott, Allison, and Stiles seek answers from Gerard and Peter. Flashbacks reveal young Derek's romance with Paige, which ends tragically when Derek mercy-kills her after a failed werewolf bite. Gerard recounts how he blinded Deucalion. The episode concludes with the revelation that Deucalion isn't always blind; he can see as a wolf.

Season 3, Episode 9: The Girl Who Knew Too Much - Deputy Tara is murdered by the Darach. Lydia learns she's a banshee as Ms. Blake reveals herself as the Darach. Stiles attempts to convince his father about the supernatural, but Sheriff Stilinski only believes after witnessing Scott's werewolf form. The Darach abducts Sheriff Stilinski.

Season 3, Episode 10: The Overlooked - A storm traps Scott and Derek in an evacuated hospital where Cora's condition worsens. Jennifer, the Darach, promises to save Cora and reveal Sheriff Stilinski's location in exchange for safe passage. Jennifer betrays them, knocking Derek unconscious and kidnapping Melissa McCall. Scott is left with a difficult choice as he is forced to align with Deucalion.

Season 3, Episode 11: Alpha Pact - With the guardians (Melissa McCall, Sheriff Stilinski, and Chris Argent) kidnapped by Jennifer, Scott aligns with Deucalion to find her. Derek attempts to save a dying Cora by using his Alpha spark. Scott, Allison, and Stiles undergo a ritualistic near-death experience to locate the Nemeton. The episode concludes with Derek absorbing the pain and mountain ash from Cora, causing him to lose his Alpha status.

Season 3, Episode 12: Lunar Ellipse - Scott, Allison, and Stiles awaken knowing the Nemeton's location after a dangerous ritual. Jennifer, empowered by the lunar eclipse, kills Kali and weakens the twins. Stiles arrives with a bat to help rescue the parents trapped in the collapsing root cellar. Scott becomes a True Alpha and Deucalion kills Jennifer.

Season 3, Episode 13: Anchors - Following the surrogate sacrifice, Scott, Stiles, and Allison experience disturbing side effects. Scott struggles with his Alpha form, Stiles battles nightmarish sleep paralysis, and Allison hallucinates Kate Argent. Scott meets Kira, and Sheriff Stilinski reopens a cold case. Allison nearly shoots Lydia during a hallucination. The episode concludes with Scott and Stiles seeking a body related to the cold case.

Season 3, Episode 14: More Bad Than Good - Scott and his friends race to capture Malia, the werecoyote, before her father does. Derek and Peter are freed by Braeden, who reveals Deucalion hired her. Allison hallucinates Kate. Scott confronts Malia, using his Alpha roar to transform her back into a human. Stiles regains his ability to read as Malia reunites with her father.

Season 3, Episode 15: Galvanize - A murderer, Barrow, escapes custody, targeting individuals with glowing eyes. Scott and his friends try to protect Kira, whom Barrow intends to harm. Stiles and Lydia investigate the school, realizing Barrow's plan involves electricity. Kira absorbs a massive electrical surge, revealing her powers. The episode concludes with Derek seeking guidance from his deceased mother.

Season 3, Episode 16: Illuminated - A blackout hits Beacon Hills as the teens throw a blacklight Halloween party. Scott helps Kira erase photos revealing her glowing aura. Stiles discovers he wrote the message that led Barrow to Kira. Ethan and Lydia are attacked and marked with a "5". Scott sees Kira's aura as a fox.

Season 3, Episode 17: Silverfinger - Chris recounts his first encounter with the Oni, leading him to seek out Katashi, a Yakuza member. Stiles, experiencing disturbing symptoms, seeks help from Melissa. Scott and Kira's relationship deepens as she sees his werewolf form. Stiles is attacked by the Oni in the hospital, but he inexplicably absorbs one. The Oni then converge on the McCall house.

Season 3, Episode 18: Riddled - Stiles goes missing, calling Scott in a panic from an unknown location with a leg injury. Lydia uses her abilities to try and locate him. Stiles is revealed to be possessed by the Nogitsune. At the hospital, during an MRI, Stiles disappears. The episode concludes with Stiles, now fully corrupted, confronting Kira's mother.

Season 3, Episode 19: Letharia Vulpina - Deaton seeks Letharia Vulpina to poison the Nogitsune. Stiles sets traps, injuring Coach. Scott absorbs a dying deputy's pain. Kira discovers her Kitsune powers amidst hospital chaos. Stiles reveals himself as the Nogitsune, stabbing Scott. Deaton injects Stiles with the lichen extract.

Season 3, Episode 20: Echo House - Stiles checks into Eichen House, hoping to protect others from the Nogitsune. He enlists Malia's help to find information, and they discover the Nogitsune's bandaged body. To save Malia from Oliver, who is possessed by the Nogitsune, Stiles allows the Nogitsune to repossess him. Malia leaves Eichen House to deliver information to Scott.

Season 3, Episode 21: The Fox and the Wolf - Noshiko reveals her past at a WWII internment camp, explaining the Nogitsune's origin and her connection to it. Mr. Yukimura is sickened by the Nogitsune when he refuses to disclose the location of Noshiko's last Kaiken. The episode concludes with Sheriff Stilinski entering Derek's loft, where he's greeted by Stiles, now fully possessed.

Season 3, Episode 22: De-Void - Stiles, possessed by the Nogitsune, faces off against the Sheriff, Allison, and Derek at Derek's loft. The confrontation reveals the Nogitsune's chaos-fueled strength and leads to a battle with the Oni. Scott and Lydia enter Stiles' mind to try and free him, while the Nogitsune unleashes flies, possessing Aiden and others. The episode concludes with Stiles stabbing himself, releasing more flies and disappearing.

Season 3, Episode 23: Insatiable - Scott's pack races to rescue Lydia from the Nogitsune, who gains control of the Oni. Allison is fatally stabbed by an Oni during the fight. She dies in Scott's arms, declaring him her first love. The episode concludes with the devastating aftermath of her death.

Season 3, Episode 24: The Divine Move - Scott's pack faces the Nogitsune in a final showdown, realizing they're trapped in an illusion. Aidan dies heroically fighting the Oni. Scott and Kira defeat the Nogitsune, trapping his essence in a box. Though Stiles is revived, the victory is bittersweet as the consequences of the Nogitsune's actions linger.