The vampire Angel, cursed with a soul, moves to Los Angeles and aids people with supernatural-related problems while questing for his own redemption.
The vampire Angelus, now known as Angel, has a human soul, but committed terrible crimes in the past.
Seeking forgiveness and trying to redeem himself, he moves from Sunnydale (and a relationship with Buffy Summers, of "Buffy the Vampire Slayer") to Los Angeles, where he helps the downtrodden by thwarting the supernatural creatures that prey on them.