The Three Geeks mistakenly turn Buffy invisible. The Slayer takes some advantage from going unseen. Willow has to do the detective without using magic, while Xander finds Spike doing some weird physical training.
When Buffy gets a job at the Doublemeat Palace, a local fast-food restaurant, she begins to believe that disappearing co-workers and the secret ingredient to the restaurant's hamburger may be connected.
It's the day of Xander and Anya's wedding. Emotions are running high with Xander's disfunctional family clashing with Anya's demon friends. The ceremony is disrupted when an old man claiming to be the future Xander shows up.
After Buffy is stung by a demon, she begins to have vivid day-dreams about a mental asylum. She gradually begins to believe that she is a crazy girl back in L.A and that Sunnydale and all her friends are just a figment of her imagination.
The Scoobies continue to try and stop Dark Willow, who is now intent on destroying the world. After Dark Willow neutralizes Buffy, though, Xander is the only one left who can save the day. Meanwhile, in Africa, Spike completes the demon trials and gets his reward.
Sunnydale High is re-opened, with a new designed campus and a new principal, Robin Wood. It is Dawn's first day at school there and Buffy accompanies her to class, only to discover evil spirits lurking in the basement.
Though they seem to be in the same places at the same time, Buffy, Xander and Dawn are unable to find Willow when she returns from England. Shortly after returning to Sunnydale, people start turning up skinned alive. As Buffy and Xander worry that this could be Willow's work, Willow sets out to find the creature that did it.
Anya grants a young woman's wish, and the violent and deadly act of vengeance leaves everyone stunned. Buffy must put aside her feelings for her friend and take action before more people die. Meanwhile, flashbacks depict how Anya became a vengeance demon, and Willow returns to college.
Dawn's simple crush on Sunnydale High's star quarterback RJ starts to become obsessive, leading Buffy to investigate the boy herself. When Buffy, along with all the other women who see RJ, also fall in love with him, Spike and Xander must team up to discover the source of this attraction. But first they have to keep the women from doing anything crazy in their competition for RJ's affection.
Buffy has a conversation with a vampire who once went to Sunnydale High, and learns something interesting about Spike. Joyce materialises to Dawn in the living room. The ghost of Cassie brings a message to Willow from beyond the grave. Meanwhile, Andrew and Jonathan have returned to Sunnydale on a mission to save the town
Spike is held captive in the Summers home while the Scoobies ponder their options in the aftermath of his murder spree. Willow finds Andrew buying blood and decides to take him prisoner also. While they try to decide what to do next, the gang are interrupted by the mysterious hooded figures called "Harbingers"... the minions of the First Evil.
Giles returns to Sunnydale with three potential slayers, whom Buffy must protect from The First. Meanwhile, a ferocious Uber-vampire is released from the Hellmouth and Buffy must kill it before it kills one of the potentials.