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 Investigations
After the events of Buffy the Vampire Slayer Season Eight in which Angel was the masked Big Bad known as Twilight and was later possessed by the cosmic entity of the same name when he killed Rupert Giles, Slayer Faith Lehane inherits Giles' home in London and takes Angel in to rehabilitate him. As such, Angel Investigations is no more. However Charles Gunn and Angel's son Connor appear for one arc known as Family Reunion when Angel & Faith visit LA with Willow. There, Gunn mentions Nina has gotten married and Kate Lockley is back with the LAPD investigating supernatural crimes, since the mystical world became public knowledge in Season Eight. And Illyria later appears in the Buffy title set in San Francisco.