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 (Buffy the Vampire Slayer)
After his departure from "Buffy", Angel appeared in his own spin-off series, titled "Angel". Moving to Los Angeles, he starts a supernatural detective agency called Angel Investigations. He dedicates himself to "helping the helpless," and becomes a Champion of The Powers That Be, who send him psychic visions through his employees Doyle (Glenn Quinn), and later Cordelia (Charisma Carpenter). In doing so, he frequently clashes with the powerful law firm Wolfram & Hart, who represent the evil of the world. During this season (1999–2000), Buffy and Angel appear in each other's shows (the "Buffy" episode "Pangs" and the "Angel" episode "I Will Remember You"), but are forced to accept that nothing has changed and they still can't or shouldn't be together. Later in the television season, Buffy crosses over into the episode "Sanctuary" where she attempts to kill rogue Slayer Faith (Eliza Dushku) to whom Angel shows compassion, and Angel appears in "Buffy"'s "The Yoko Factor" where he squares off with Buffy's new boyfriend Riley (Marc Blucas). They finally decide to stay away from each other's business and stick to phone calls at this point. In the season one finale, Angel is given some hope at redemption when the Shanshu prophecy reveals that a vampire with a soul may eventually become human after fulfilling his role in the upcoming apocalypse.