Buffy contends with a weird college roommate and dating campus men, while Xander unexpectedly returns from his adventure. 

The gang unites to encourage Buffy's oppressive roommate to move out, and Buffy finds herself attracted to a handsome upperclassman. 

Buffy acts on her crush with Parker Abrams and they make love. Meanwhile, Spike returns to Sunnydale with his girlfriend Harmony, a former classmate of Buffy's. The pair are trying to find a powerful stone in an underground chamber. Anya has also returned and she only has eyes for Xander. 

Willow, Oz and Xander convince Buffy to join them at a fraternity Halloween party, and Giles tries to catch the holiday spirit. 

While tending a bar, Xander becomes alarmed when an intoxicated Buffy and her new drinking buddies are reduced to a primordial state. 

Buffy tries to comfort Willow when Oz answers the call of the wild and is drawn to another woman, who turns out to be a fellow werewolf. 

Spike is kidnapped by a commando squad and held in an underground laboratory, and Riley, the teacher's assistant, confides in Willow about his crush on Buffy. 

Angel secretly arrives in Sunnydale to protect Buffy from the vengeful spirits of Chumash Indians, who materialise on Thanksgiving. 

When a spell cast by Willow goes awry, Buffy vows to marry Spike, Giles loses his sight, and Xander attracts an overabundance of demons. 

Sunnydale residents lose the power of speech as mysterious creatures search the town for human hearts to steal. 

A suicidal Spike is revivified by an approaching apocalypse, while Buffy and the gang must return to high school to seal Sunnydale's hell mouth. 

After Giles turns to old friend Ethan Rayne for comradeship, he is transformed into a demon and hunted down by an unknowing Buffy. 

Buffy's friends question her heightened involvement with Riley and the Initiative, while Professor Walsh gives Buffy a hazardous assignment. 

Buffy and Riley's relationship is put to the test when she investigates Professor Walsh's death and comes up against the Initiative's secret weapon. Elsewhere in town, Spike has become the outcast among demons since he has taken up with the Scooby-Doo Gang. 

Faith, the outlaw slayer, awakens from her coma and makes a beeline for Buffy's mother's house, hungry for revenge against her rival. 

Buffy, having switched bodies with Faith, finds herself at the mercy of Watcher council members. Meanwhile, Faith uses Buffy's body to further her own ends. 

Buffy senses that something is amiss when Jonathan becomes a hero to everyone in Sunnydale. 

When Buffy and Riley rouse a supernatural force, they are held hostage by ghost-children who have returned to exact revenge for past abuses. 

Oz returns to Sunnydale one last time, and is captured by the Initiative during a full moon. A conflicted Willow tells Buffy about her new relationship with Tara. 

Riley spars with Angel during a surprise visit to Sunnydale, while Adam decides to advance his plans for humanity's demise by enlisting Spike to turn the gang against one another, without their suspecting it. 

Buffy's estrangement from her friends threatens the prevention of Adam's (George Hertzberg) plan to design a master race of human/demon hybrids. 

The atavistic spirit of the first Slayer stalks the dreams of Buffy, Giles, Willow and Xander, making them each face their innermost fears.