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
The cast of characters grew over the course of the series. Buffy first arrives in Sunnydale with her mother, Joyce Summers (portrayed by Kristine Sutherland), who functions as an anchor of normality in the Summers' lives even after she learns of Buffy's role in the supernatural world ("Becoming, Part Two"). Buffy's younger sister Dawn Summers (Michelle Trachtenberg) is introduced in season five ("Buffy vs. Dracula"). A vampire tortured with a soul in return for horrific deeds committed in the past to many, including a young gypsy girl and her family, Angel (portrayed by David Boreanaz), is Buffy's love interest throughout the first three seasons. He leaves Buffy as he believes he isn't good enough for her. He goes on to make amends for his sins and to search for redemption in his own spin-off, "Angel". He makes several guest appearances in the remaining seasons, including the last episode.