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".
The Lost Slayer
Shortly after, Willow, Xander, Oz and Buffy enter a room to find Angel suspended in mid-air with a stake protruding from his heart, and yet he still lives. Giles has imprisoned Angel here for the past five years when Angel went out searching for Buffy. The orb Angel is trapped in freezes his body in the moment before his death; if the spell is broken, Angel will instantly die. Giles finds them all and Buffy stays to fight while the others rush off to help the other troops. Buffy initially is hesitant as Giles plays on her emotions, but with the help of Angel, she finally breaks through it, fighting Giles with the same sword she once sent Angel to Hell with. Eventually Giles gets the sword, but Buffy tricks him into hitting the orb trapping Angel, injuring Giles and causing Angel to finally die. Buffy grabs the stake Giles killed Angel with and stakes Giles, finally killing him, despite him taking on his human face again to play on her emotions. Meanwhile, Willow and Buffy's other friends try to help in the main fight, but there are too many vampires and most of the Council operatives are dead, leaving only three left. Wesley is killed by Giles' second in command Jax, who goes to kill Anna, the other Slayer, but Xander sacrifices himself to save her, killing Jax. The grief of his death causes Willow to tap into all her power and destroy the vampire army by smashing the windows and uncovering them, exposing the vampires to sunlight. Unfortunately both Wesley and Xander die as well as many of the Council operatives, but Giles and his army are dead and the world is saved.