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".
Angel (season 1)
Series co-creator David Greenwalt points out "there's no denying that "Angel" grew out of "Buffy"". Several years before "Angel" debuted, Joss Whedon developed the concept behind "Buffy the Vampire Slayer" to invert the Hollywood formula of "the little blonde girl who goes into a dark alley and gets killed in every horror movie." The character Angel was first seen in the first episode of "Buffy" and became a regular, appearing in the opening credits during seasons two and three. After being turned into a soulless, immortal vampire, he became legendary for his evil acts, until a band of wronged Gypsies punished him by restoring his soul, overwhelming him with guilt. Angel eventually set out on a path of redemption, hoping that he could make up for his past through good deeds. In "Buffy"'s season three finale, he leaves Sunnydale for L.A. to continue his atonement without Buffy. Whedon believed that "Angel was the one character who was bigger than life in the same way that Buffy was, a kind of superhero." Whedon has compared the series to its parent, "It's a little bit more straightforward action show and a little bit more of a guys' show."