After Faith switches bodies with Buffy via the device that was left for her by the Mayor, she begins to slip into Buffy's life. When the police try to take away Faith (Buffy in Faith's body) she is kidnapped by a special group from the Watcher's Council. As Buffy tries in vain to convince them that she is not Faith, Faith in Buffy's body is out having a good time. Willow attempts to introduce Tara to Buffy but when Tara senses that something is amiss they perform a spell which uncovers the switch. The man/demon/machine Adam has determined that his purpose is tohug and recruits some vampires to help. The vampires take over a church and both Faith and Buffy arrive to stop them. Using a Katra that Willow and Tara conjured, Buffy gets her own body back and Faith runs and disappears without a trace.
 s04e01 - The Freshman
        s04e01 - The Freshman
          
        
      
     s04e02 - Living Conditions
        s04e02 - Living Conditions
          
        
      
     s04e03 - The Harsh Light of Day
        s04e03 - The Harsh Light of Day
          
        
      
     s04e04 - Fear, Itself
        s04e04 - Fear, Itself
          
        
      
     s04e05 - Beer Bad
        s04e05 - Beer Bad
          
        
      
     s04e06 - Wild at Heart
        s04e06 - Wild at Heart
          
        
      
     s04e07 - The Initiative
        s04e07 - The Initiative
          
        
      
     s04e08 - Pangs
        s04e08 - Pangs
          
        
      
     s04e09 - Something Blue
        s04e09 - Something Blue
          
        
      
     s04e10 - Hush
        s04e10 - Hush
          
        
      
     s04e11 - Doomed
        s04e11 - Doomed
          
        
      
     s04e12 - A New Man
        s04e12 - A New Man
          
        
      
     s04e13 - The I In Team
        s04e13 - The I In Team
          
        
      
     s04e14 - Goodbye Iowa
        s04e14 - Goodbye Iowa
          
        
      
     s04e15 - This Year's Girl (1)
        s04e15 - This Year's Girl (1)
          
        
      
     s04e16 - Who Are You? (2)
        s04e16 - Who Are You? (2)
          
        
      
     s04e17 - Superstar
        s04e17 - Superstar
          
        
      
     s04e18 - Where the Wild Things Are
        s04e18 - Where the Wild Things Are
          
        
      
     s04e19 - New Moon Rising
        s04e19 - New Moon Rising
          
        
      
     s04e20 - The Yoko Factor (1)
        s04e20 - The Yoko Factor (1)
          
        
      
     s04e21 - Primeval (2)
        s04e21 - Primeval (2)
          
        
      
     s04e22 - Restless
        s04e22 - Restless
          
        
      
    Buffy Summer's journey as the Vampire Slayer begins when she moves to Sunnydale, a small Californian town that, unbeknownst to most residents, sits atop a Hellmouth - a portal to supernatural forces. She is discovered by Rupert Giles, the school librarian and her Watcher, whose role is to guide and train her as the Slayer. Alongside Giles, Buffy forms an eclectic group of friends, her "Scooby Gang", including Willow Rosenberg, a shy but highly intelligent witch; Xander Harris, Buffy's best friend and comic relief; and Cordelia Chase, a popular girl who becomes a reluctant ally.
Buffy's relationships with those around her, particularly romantic entanglements, are a major focus of the series. Her most notable love interests are Angel, a vampire with a soul, and Spike, who, despite being a villain, develops a complex and evolving bond with Buffy. The complexities of her relationships, particularly her love life, highlight the emotional weight of Buffy's duties as the Slayer and her desire for connection, love, and a sense of normalcy.