Angel (season 1)
At the end of the third season of "Buffy", the 242-year-old, re-ensouled vampire Angel left Sunnydale to give teenage Slayer Buffy Summers the chance to live a normal life. Angel is now living in the big city of Los Angeles. With Buffy gone Angel is now completely cut off from society, every day getting closer and closer to giving in to his vampiric hunger. It's not until he befriends the half demon and fellow Irishman Doyle, who is sent visions of people in trouble by The Powers That Be, and fellow Sunnydale resident Cordelia Chase, who grounds Angel's life in the humanity around him, that he truly begins to take charge of his life and seek atonement for his past sins. He sets up his own detective agency, Angel Investigations and begins to "help the helpless".
Buffy the Vampire Slayer
After attempting to start a new life in Los Angeles, Buffy returns to town in season three. Angel has mysteriously been released from the demon dimension, but is close to insanity due to the torment he suffered there, and is nearly driven to suicide by the First Evil. He and Buffy realize that a relationship between them can never happen; he eventually leaves Sunnydale at the end of the season. A new watcher named Wesley is put in Giles' place when Giles is fired from the Watcher's Council because he has developed a "father's love" for Buffy; and towards the end of the season, Buffy announces that she will no longer be working for the Council. Early in the season, she meets Faith, the Slayer activated after Kendra's death. She also encounters the affable Mayor Richard Wilkins, who secretly has plans to "ascend" (become a "pure" demon) on Sunnydale High's Graduation Day. Although Faith initially works well with Buffy, she becomes increasingly unstable after accidentally killing a human and forms a relationship with the paternal yet manipulative Mayor, eventually landing in a coma after a fight with Buffy. At the end of the season, after the Mayor becomes a huge snake-like demon, Buffy and the entire graduating class destroy him by blowing up Sunnydale High.