Buffy The Vampire Slayer S06E21

Two to Go (Part 1)

 The Scoobies must protect Jonathan and Andrew from Willow.

Buffy The Vampire Slayer S06E20

Villains

Willow, after being told Tara cannot be resurrected, is pushed over the edge by her grief. After magically saving Buffy, a dark Willow hunts The Trio, starting with Warren. 

Buffy The Vampire Slayer S06E19

Seeing Red

Willow and Tara reconcile, and Tara tells Willow that Spike and Buffy have been sleeping together. Buffy stops The Trio when attempting a large-scale theft, but Warren escapes with a jetpack. 

Buffy The Vampire Slayer S06E18

Entropy

Anya seeks vengeance on Xander and when looking for someone who wants the same, she finds comfort with Spike. Xander sees their impulsive behavior through a camera and tries to stake Spike. Willow and Tara arrange a date, which ends with the two of them kissing.

Buffy The Vampire Slayer S06E17

Normal Again

Warren, Jonathan, and Andrew unleash a demon whose powers make Buffy believe that her friends are figments of her imagination. Buffy attempts to attack her friends, locks them in her basement and unleashes the same demon on them. Tara eventually finds the trio and Buffy recovers from the demon's poison by drinking an antidote. By the end of the episode however, it is unclear which world is reality. 

Buffy The Vampire Slayer S06E16

Hell's Bells

Before Xander and Anya's wedding, Xander's future self suddenly appears, and warns him that his marriage to Anya will be the beginning of a life of disgrace and pain. Xander is shown flashes of the future, convincing him to call it off, but later it is discovered it is only a demon taking revenge on Anyanka from her demon days. Nevertheless, the wedding doesn't go ahead and Anya and Xander break up. 

Buffy The Vampire Slayer S06E15

As You Were

Riley returns to town - newly married - and enlists Buffy's help to track down a demon. Her encounter with Riley causes Buffy to end her relationship with Spike.