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".
First Evil
The First makes its initial appearance in the series as a monster of the week that Angel must face in the episode "Amends". It tries to drive the vampire to kill Buffy by reminding him of his "true" nature (Angelus) and it sets about accomplishing this by appearing to him as some of his victims: Daniel, Margaret, Travis and Jenny Calendar. It claims that it is responsible for Angel's return from Hell, and suggests that Angel can end his sufferings by turning evil again and killing Buffy, but instead he chooses to kill himself using the sunrise. His suicide is only averted by a freak snow storm unheard of in Southern California. Episodes of the spin-off series "Angel" later suggest that Angel was returned from hell and his life saved by divine intervention from the heavenly Powers That Be.