<P> After attempting to start a new life in Los Angeles, Buffy returns to town in season three . Angel has mysteriously been released from the demon dimension, but is close to insanity due to the torment he suffered there, and is nearly driven to suicide by the First Evil . He and Buffy realize that a relationship between them can never happen; he eventually leaves Sunnydale at the end of the season . A new watcher named Wesley is put in Giles' place when Giles is fired from the Watcher's Council because he has developed a "father's love" for Buffy; and towards the end of the season, Buffy announces that she will no longer be working for the Council . Early in the season, she meets Faith, the Slayer activated after Kendra's death . She also encounters the affable Mayor Richard Wilkins, who secretly has plans to "ascend" (become a "pure" demon) on Sunnydale High's Graduation Day . Although Faith initially works well with Buffy, she becomes increasingly unstable after accidentally killing a human and forms a relationship with the paternal yet manipulative Mayor, eventually landing in a coma after a fight with Buffy . At the end of the season, after the Mayor becomes a huge snake - like demon, Buffy and the entire graduating class destroy him by blowing up Sunnydale High . </P> <P> Season four sees Buffy and Willow enroll at UC Sunnydale, while Xander joins the workforce and begins dating Anya, a former vengeance demon . Spike returns as a series regular and is abducted by The Initiative, a top - secret military installation based beneath the UC Sunnydale campus . They implant a microchip in his head that punishes him whenever he tries to harm a human . He makes a truce with the Scooby Gang and begins to fight on their side, purely for the joy of fighting, upon learning that he can still harm other demons . Oz leaves town after realizing that he is too dangerous as a werewolf, and Willow falls in love with Tara Maclay, another witch . Buffy begins dating Riley Finn, a graduate student and member of The Initiative . Although appearing to be a well - meaning anti-demon operation, The Initiative's sinister plans are revealed when Adam, a monster secretly built from parts of humans, demons and machinery, escapes and begins to wreak havoc on the town . Adam is destroyed by a magical composite of Buffy and her three friends, and The Initiative is shut down . </P> <P> During season five, a younger sister, Dawn, suddenly appears in Buffy's life; although she is new to the series, to the characters it is as if she has always been there . Buffy is confronted by Glory, an exiled Hell God who is searching for a "Key" that will allow her to return to her Hell dimension and in the process blur the lines between dimensions and unleash Hell on Earth . It is later discovered that the Key's protectors have turned the Key into human form--Dawn--concurrently implanting everybody with lifelong memories of her . The Watcher's Council aids in Buffy's research on Glory, and she and Giles are both reinstated on their own terms . Riley leaves early in the season after realizing that Buffy does not love him and joins a military demon - hunting operation . Spike, still implanted with the Initiative chip, realizes he is in love with Buffy and increasingly helps the Scoobies in their fight . Buffy's mother Joyce dies of a brain aneurysm, while at the end of the season, Xander proposes to Anya . Glory finally discovers that Dawn is the key and kidnaps her . To save Dawn, Buffy sacrifices her own life by diving into the portal to the Hell dimension and thus closes it with her death . </P> <P> At the beginning of season six, Buffy has been dead for 147 days, but Buffy's friends resurrect her through a powerful spell, believing they have rescued her from a Hell dimension . Buffy returns in a deep depression, explaining that she had been in Heaven and is devastated to be pulled back to Earth . Giles returns to England because he has concluded that Buffy has become too reliant on him, while Buffy takes up a fast - food job to support herself and Dawn, and develops a secret, mutually abusive relationship with Spike . Dawn suffers from kleptomania and feelings of alienation, Xander leaves Anya at the altar (after which she once again becomes a vengeance demon), and Willow becomes addicted to magic, causing Tara to temporarily leave her . They also begin to deal with The Trio, a group of nerds led by Warren Mears who use their proficiency in technology and magic to attempt to kill Buffy and take over Sunnydale . Warren is shown to be the only competent villain of the group and, after Buffy thwarts his plans multiple times and the Trio breaks apart, he becomes unhinged and attacks Buffy with a gun, killing Tara in the process . This causes Willow to descend into a nihilistic darkness and unleash all of her dark magical powers, killing Warren and attempting to kill his friends . Giles returns to face her in battle and infuses her with light magic, tapping into her remaining humanity . This overwhelms Willow with guilt and pain, whereupon she attempts to destroy the world to end everyone's suffering, although it eventually allows Xander to reach through her pain and end her rampage . Late in the season, after losing control and trying to rape Buffy, Spike leaves Sunnydale and travels to see a demon and asks him to "return him to what he used to be" so that he can "give Buffy what she deserves ." After Spike passes a series of brutal tests, the demon restores his soul . </P>

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