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 5)
Co-creator David Greenwalt, who had left "Angel" in an official capacity at the end of season three, came back to direct the antepenultimate episode of the series, "The Girl in Question".
"Buffy the Vampire Slayer" concluded the previous season, therefore there are no official crossovers between the two series. Despite this, references are made throughout the fifth season of "Angel" that relate to "Buffy the Vampire Slayer". Spike is resurrected (after his death in "Chosen") by the magical amulet Angel gave to Buffy at the start of the finale. Spike subsequently becomes a main character of the season. Harmony Kendall (Mercedes McNab) also becomes a main character and joins the star cast for the season. "Buffy" recurring character Andrew Wells (Tom Lenk) appears in two episodes ("Damage" and "The Girl in Question"), revealed to be a Watcher-in-training. Andrew states in "Damage" that Xander is in Africa, Willow and Kennedy are in Brazil, Buffy and Dawn are in Rome, and everyone else is in England.