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 (Buffy the Vampire Slayer)
Season three (2001–2002) sees Angel struggle with fatherhood when Darla returns pregnant with his child, despite the fact that vampires supposedly are unable to conceive. When Darla kills herself to give birth, Angel is left to raise the baby Connor (played by triplets Connor, Jake and Trenton Tupen) and protect him from those who wish to get their hands on a child of two vampires. False prophecies, time travel, and betrayal lead to Angel losing his infant son to an old enemy, Holtz (Keith Szarabajka), who abducts Connor into a hell dimension where time passes differently. Connor (Vincent Kartheiser) returns days later, fully grown and under the belief that Angel is a soulless monster. Holtz kills himself and Angel is framed for his death by Holtz's lover, prompting Connor to take revenge by sinking his father to the bottom of the ocean. Over the course of this season, Angel's friendship with his colleague Cordelia evolves into romance, but circumstances prevent him from ever confessing his feelings.