Angelus
Angelus is a fictional character in the television shows, Buffy the Vampire Slayer and Angel played by David Boreanaz. He is the demonic alter ego of Angel, and emerges whenever Angel loses his soul.
Spoiler warning: Plot or ending details follow.
As Angelus, he was responsible for most of Angel's more reprehensible crimes including the killing of his family and of his village and the deaths of Holtz's family and the turning of his daughter into a vampire who Holtz himself had to kill. Angelus himself was known for siring the vampires Penn, who indulged in his blood lust by being a serial killer, and Drusilla who Angelus drove insane before making her a vampire. He was also responsible for training William the Bloody who attributed Angelus as his Yoda.
Angelus was then later imprisoned in Angel by a clan of Gypsies avenge themselves after he fed off one of their members. There trapped in his own body, he was forced to watch from the sidelines as Angel tried to achieve redemption, a unique form of torture for both Angelus and Angel.
Angelus's first actual appearance was in Buffy 's season two episode "Innocence". Angelus is the form of Angel without a soul. The only way for Angel to lose his soul is by a true moment of happiness, so the first time Angel lost his soul was when he had sex with Buffy.
After Angel became Angelus, he went back to a semi-feral state, and became evil, joining Spike and Drusilla. Angelus's first main kill was Jenny Calendar whose neck was broken after she got too close in figuring out how to restore Angel's soul.
Magic can be used to return Angelus's soul, which is what happened in the first place. Willow Rosenberg returned Angelus's soul with the use of a Orb of Thesulah, but Buffy was forced to send Angel to hell where he was eventually extracted by the Powers That Be.
Angel's soul was removed again when he was put into a dream world where he had freed the world from the Beast, recounciled with both Connor and Wesley and then had sex with Cordelia Chase, and lost his soul again, becoming Angelus. As Angelus, he fed off of, but did not kill, Lilah Morgan. Eventually, his soul was returned, due to the help of the rogue Slayer Faith. Since then, Angelus has not been seen.
It has twice been assumed that Angel had reverted to Angelus, once in the Buffy season three episode "Enemies" and again in the Angel season five episode "Power Play". Both times, Angel had been merely duping his enemies into believing he had lost his soul, in order to gain their confidence and obtain vital information.
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