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".
Graduation Day (Buffy the Vampire Slayer)
Buffy and Angel discuss Worth's work, which Buffy doesn't understand. The two discuss the confusing nature of their relationship, when Angel is struck in the back by an arrow fired by Faith, which misses his heart. At the library, the arrow is removed, and Giles and Wesley go over Mr. Worth's files, which indicate that Worth found a gigantic carcass underneath the rubble of a volcanic eruption, which he believed may have been a new type of dinosaur. The group assumes this must be some sort of demon, when Angel falls to the ground - the arrow has been poisoned with a toxin fatal to vampires. Faith reports her attack to the Mayor, and amuses him with a few stories from her childhood before he continues preparations for the ascension. Wesley tells Buffy the Watcher's Council refuses to help Angel because he is a vampire, but Willow's research reveals the poison has a cure - the blood of a Slayer.