Episode 3.17 Enemies
Episode Summary
Original Air Date: March 16, 1999
As a part of her new alliance with the Mayor, Faith tries to seduce Angel so that he will again lose his soul. When that fails, the Mayor summons a powerful demon to remove Angel's soul with dark magic.
--from the Internet Movie Database
Faith and the Mayor's secret alliance becomes an all-powerful triumvirate of evil against Buffy when they conspire to rob Angel of his soul. Meanwhile, Giles has unofficially resumed his role as Watcher, as Wesley is distracted from his sacred duties by Cordelia's amorous attention.
--from Much Ado About BTVS