and the next replacement is seen in season 3. In the episode "Surprise", Buffy loses her virginity to Angel, an event which triggers the loss of his soul and unleashes his sadistic alter-ego, Angelus. Angelus proceeds to subject the characters to mental and physical torture for the remainder of the season. In the final episode of season two, Buffy is forced to reveal her identity as the Slayer to her mother (Kristine Sutherland), and send the newly good Angel to hell to save the world. She then leaves Sunnydale for Los Angeles in the hopes of escaping her life as the Slayer. Season three (1998–1999) sees Buffy reconnect to her calling, her friends, and her family after her departure, as well as make difficult life decisions regarding her relationship with the resurrected Angel. She must also deal with the introduction of rebellious new Slayer Faith (Eliza Dushku), who becomes increasingly destructive and disloyal over the course of the season. In the season finale, Buffy stabs Faith in an attempt to save Angel's life, and leads her classmates into a climactic battle against the demonic Mayor of Sunnydale (Harry Groener). Angel then leaves Sunnydale in hopes that Buffy can have a more normal life without him. In the fourth season (1999–2000), Buffy balances her Slayer duties with her new life as a college student at UC Sunnydale. She experiences some difficulty adjusting to college life, and becomes increasingly disconnected from her friends, who all seem to be moving in different directions. Buffy eventually finds a new love interest in the form of Riley Finn (Marc Blucas), a soldier in the demon-hunting government task force known as The Initiative. She briefly joins forces with Riley's team, until they discover one of the Initiative's experiments, Adam (George Hertzberg), is creating an army of demon-human hybrids. Buffy unites with her friends to defeat Adam in a spell which invokes the power of the First Slayer. During Buffy season four, Buffy also appears in the first season of spin-off series Angel (1999–2000), guest starring in the episodes "I Will Remember You" and "Sanctuary". In season five (2000–2001), Buffy battles the hell-goddess Glory (Clare Kramer), and fully embraces her destiny for the first time. A younger sister named Dawn (Michelle Trachtenberg) mysteriously appears in Buffy's household, her existence having been seamlessly integrated with memories of the other characters. Buffy suffers emotional turmoil throughout this season, including