Buffy returns home, but finds that picking up the pieces of the life she left behind may not be as easy as she had hoped. Her mother is trying to accept her back with open arms, but she doesn't seem to trust that Buffy won't just run away again. Her friends seem happy to see her, but their odd behavior makes it appear that they silently resent Buffy for taking off. And, of course, before these problems can be laid to rest, the dead of Sunnydale start to rise.

The new Slayer, Faith, who was called after Kendra died, arrives in town and seems like a fun-loving wacky teenager who fits right in with the gang. Buffy worries that Faith may be taking her place in her friends hearts, and Buffy then begins to suspect that she is hiding something.

When a student is found savagely mauled in the woods, all suspicions point to Oz-werewolf. However, when Buffy discovers that Angel is back on Earth after hundreds of years of torture and has been reduced to nothing more than a wild animal, she fears that he may be the killer.

When Cordelia flaunts her sure win for Homecoming Queen it awakens the prom queen within Buffy and they fight for the title. Meanwhile, the new vampire in town, Mr. Trick, rallies a group of tough vampires, demons and mercenaries together to play a game with the two Slayers, "Slayerfest '98."

Mr. Trick enlists Giles's old buddy Ethan Rayne to manufacture and distribute boxes of candy which turn the adult population into uninhibited, irresponsible teenagers to keep them out of the way while the mysterious Mayor Richard Wilkins III pays a tribute to a demon.

 

Wanting to be rid of Xander for good, Cordelia comes to the conclusion that Buffy is the cause of all her problems and makes a wish that Buffy had never come to Sunnydale. A demon grants the wish and Cordelia's world suddenly changes.

While the gang prepares for their Christmas vacation, Angel is haunted by visions of his violent past. The ghost of Jenny Calendar appears to him and reminds him in great detail of the evil deeds he has performed. At first she almost seems to be taking pity on him, but gradually her counsel grows more sinister.

Picking the wrong night for mother-daughter bonding, Joyce discovers the bodies of two children in the park, apparently sacrificed in an occult ritual. Deeply disturbed by what she has seen, Joyce rallies the adults of Sunnydale, convincing them to rid the town of all magical and occult influences. Soon, however, it becomes apparent that Buffy, Willow, and Amy are themselves considered a part of the occult threat to Sunnydale.

For her upcoming 18th birthday, Buffy declines the Scooby gang's offer of a big party, hoping to celebrate with quiet reflection and a traditional trip to the ice show with her father. But unbeknownst to Buffy, preparations are being made for a life-threatening rite of passage that drains the slayer of her powers and then entraps her with a powerful vampire foe that she must defeat in a defenseless state in order to pass the test.

When Xander realizes that he isn't needed by the gang as much as he'd like to believe, his quest to prove he's cool leads him to an unforgettable night that finds him consorting with fast women, raising the dead and rolling with a dangerous crowd that could put Sunnydale in a world of hurt. Meanwhile, Buffy, Giles and the rest of the crew engage in a furious battle with the Sisterhood of Jhe, an all-female demon apocalypse cult that intends to reopen the Hellmouth and bring about the end of the world.

While on a mission to retrieve an amulet before a powerful demon can use it to restore his strength, Faith introduces Buffy to her reckless method of slaying which leaves Buffy wanting more of the wild life. Meanwhile Giles is trying to keep his cool in front of the insufferably stuffy new watcher, Wesley Wyndam-Pryce.

 

Buffy tries to convince Faith to face up to the consequences of her actions, but Faith thinks that being a Slayer puts her above the law. Buffy confides in Giles about the accidental murder and he decides not to involve the new Watcher, Wesley. Angel captures Faith and tries to connect with her but Wesley and the Watcher's Council intervene with disastrous consequences.

Anya convinces an unsuspecting Willow to assist her with a spell that will return her amulet and, with it, her Vengeance Demon powers. Willow, sensing something wrong with the magic, balks at the last minute and disrupts the spell. Instead of returning the amulet, the spell summons the vampire Willow from the alternate universe in ‘The Wish’ and sets her loose in Sunnydale.

As a part of her new alliance with the Mayor, Faith tries to seduce Angel so that he will again lose his soul. When that fails, the Mayor summons a powerful demon to remove Angel’s soul with dark magic.

After an encounter with a mouth-less demon Buffy is infected with the demon's blood and she gains the ability to hear people's thoughts. At first her newfound ability is useful for cheating on schoolwork and eavesdropping on the thoughts of those around her, but when the voices continue to flood her mind, she realizes that she cannot control the power. Amid the chaos, Buffy hears a killer planning a mass murder at the school. Now she must keep herself from going mad long enough to prevent a catastrophe.

Buffy receives an acceptance to Northwestern University, but what should be a happy surprise turns sour when she realizes that she may not be able to go away to school and still fulfill her duties as the Slayer. Buffy manages to intercept the Box of Gavrok, a container of mystical energy that is vital to the Mayor’s Ascension. But when Willow is captured, the gang must decide whether they can give up their best chance at preventing the Ascension to save Willow’s life.

The biggest night in High School life is just around the corner, when strange creatures start appearing around town attacking anyone in formalwear. Meanwhile, Angel tells Buffy that he wants her to have a chance at the normal life that he could never give her. He plans to leave Sunnydale after the Ascension. Buffy must put aside her own pain and try to track down the source of the demonic Hellhounds in time to save the Senior Prom.

 

The gang receive some valuable information from old enemy Anya who has actually witnessed an Ascension. She reveals that the Mayor plans to transform himself into pure demon, something that has not been seen for thousands of years. When Angel is poisoned by Faith to distract Buffy, Buffy faces Faith for the final time in order to get the only cure to the poison: Faith's blood.

During their battle, Faith manages to escape from Buffy, so Buffy forces Angel to drink her own blood to rid his body of the poison. With Buffy in a coma, the gang must devise a plan to defeat the Mayor once and for all.