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".
I Will Remember You (Angel)
Buffy surprises Angel with a visit to Los Angeles. Their emotion-driven discussion is interrupted by the arrival of a Mohra demon. Angel stabs the demon, but it retreats to the sewers. Buffy and Angel hesitantly follow, discussing their future as a couple and the feelings about each other. They split up; Angel meets the demon on his route. As they fight, the Mohra demon cuts Angel. Angel kills the demon. Its blood, eventually found to be the Blood of Eternity, merges with his own, and he becomes human.