Faith Page

Faith (Eliza Dushku) ? A Vampire Slayer. Once an uncomfortable member of Buffy's clique in Sunnydale, Faith struggled to find her place, yet often fell to the temptations of evil. After killing a human in Sunnydle . Now with the help of Angel, she seeks redemption through the only door that must close behind her as she awaits her future behind bars. Faith first appeared on Angel in episode 18 of season 1, "5X5". Faith is played by Eliza Dushku when Lindsey hire her to kill Angel Wesley (Alexis Denisof), who still feels responsibility to Faith from being her former Watcher, declares he will stop her from killing  Angel

Sanctuary   Buffy (guest star Sarah Michelle Gellar) comes to Los Angeles seeking vengeance under the guise of protecting Angel (David Boreanaz) from Faith's (guest star Eliza Dushku) violent nature, but Buffy is shocked and hurt to discover her former love siding with her nemesis. Meanwhile, Wesley (Alexis Denisof) is faced with a crisis of loyalties when the Watcher's Council offers a chance at reinstatement if he gives up Faith. Charisma Carpenter also stars.  Michael Lange directed the episode written by Tim Minear and Joss Whedon.

Judgement she had a bit part  Angel picks up the phone and on the other side of the glass, Faith picks up hers. The Slayer talks about surviving a fight in jail, and Angel talks about surviving singing Barry Manilow? no one ever said redemption was easy.

Salvage   FAITH RETURNS When Angelus (David Boreanaz) meets up with The Beast (guest star Vladimir Kulich), he learns that the rain of fire, blacking out the sun and stealing Angel's soul was all part of The Beast's mysterious master plan to bring Angelus back. Meanwhile, Wesley (Alexis Denisof) releases vampire slayer Faith (guest star Eliza Dushku) from prison to help capture Angelus. Charisma Carpenter, J. August Richards, Amy Acker, Vincent Kartheiser and Andy Hallett also star. David Fury wrote the episode directed by Jefferson Kibbee.

Release
Faith does battle with Angel
Angelus (David Boreanaz) continues his search for The Beast's mysterious master, never suspecting that it could be someone close to him. Meanwhile, Faith (guest star Eliza Dushku) and Angelus do battle while Cordelia (Charisma Carpenter) convinces Connor (Vincent Kartheiser) to keep their baby a secret. Alexis Denisof, J. August Richards, Amy Acker and Andy Hallett also star. James A. Contner directed the episode written by Steven S. DeKnight & Elizabeth Craft & Sarah Fain. 
 

Orpheus  

While in their drug-induced comas, Angelus (David Boreanaz) and Faith (guest star Eliza Dushku) experience flashbacks of Angel's good deeds over the centuries; Fred (Amy Acker) calls in Willow (guest star Alyson Hannigan, "Buffy the Vampire Slayer"), the only person ever able to restore Angel's soul and asks her to help them do it again. Charisma Carpenter, Alexis Denisof, J. August Richards, Vincent Kartheiser and Andy Hallett also star. Terrance O'Hara directed the episode written by Mere Smith