Cordelia Chase first appears in the premiere episode of "Buffy the Vampire Slayer", titled "Welcome to the Hellmouth". Introduced as a potential friend for Sunnydale High's newest student, Buffy Summers (Sarah Michelle Gellar), Cordelia reveals her true colors by cruelly mocking Willow (Alyson Hannigan) whom Buffy befriends instead. Ignorant of the supernatural, Cordelia shows up regularly throughout the first season of "Buffy" to insult and ridicule the other characters. She plays a larger role in the episode "Out of Mind, Out of Sight", in which she falls victim to a social outcast who wants revenge on popular students for ignoring her so much that she turned invisible. In the season finale, Cordelia helps Buffy and her friends battle vampires, finally coming to terms with the existence of supernatural forces. In season two, Cordelia becomes a more active ally to the "Scooby Gang" and begins a romantic relationship with Xander Harris (Nicholas Brendon) in "Bewitched, Bothered and Bewildered." Dating someone of Xander's social status causes Cordelia's ostracism from her popular peers and she reluctantly breaks up with him. However, when Xander performs a love spell to pay her back for hurting him, Cordelia realises how much he cares about her and takes him back, rejecting her superficial friends in the process. In season three's "Lovers Walk", Cordelia is heartbroken to see Xander kissing Willow and ends their relationship. By the season three episode "The Wish", Cordelia slips back into her antagonistic persona from the first season, disassociating herself from the Scooby Gang altogether. In the episode "The Prom", she reveals that her house and her family's entire wealth has just been seized for tax fraud and both of her parents (never named or seen on-camera) are now in prison. Cordelia later attempts an unsuccessful relationship with Wesley (Alexis Denisof) and makes peace with Xander at the prom. In the season three finale, she rallies alongside Buffy and her friends at graduation against the demonic Mayor of Sunnydale (Harry Groener), where Cordelia slays her first vampire.