'Becoming' - Part 2 Story Code '5V22' by Joss Whedon

The police arrest Buffy for the murder of Kendra, but she manages to escape. In disguise she visits Xander in hospital, who tells her that Willow is now in a coma; Cordelia arrives, and tells them that the vampires took Giles. Buffy goes to Giles' apartment to look for him, but instead finds Whistler, who tells her that Angel was destined to stop Acathla, not revive him. A patrol cop recognises Buffy, but Spike appears and helps her to escape; Spike tells Buffy that he also wants to stop Angelus, as he doesn't want all of humanity to disappear because it will mean that there will be nothing for the vampires to eat. Buffy takes him back to her home so they can get some weapons, but a vampire attacks her mother; after Buffy kills it she finally has to explain to her mother that she is the Slayer. Spike makes a deal with Buffy: as long as he and Drusilla can go free, they will never return to Sunnydale, and in return he will help her to destroy Angelus. Joyce is angry at Buffy for keeping her life a secret, and when Buffy tells her that she has to go, Joyce furiously tells her that if she leaves she should not bother to come back. Buffy has no choice - she leaves. Meanwhile, Giles refuses to tell Angelus and Drusilla the secret to revive Acathla, despite being dreadfully tortured by Angelus. Back at the hospital, Willow wakes up from her coma and tells the others that they need to complete the spell that will restore Angels' soul. When Buffy returns to the library to collect Kendra's sword she runs into Principal Snyder, who expels her. Drusilla hypnotises Giles into believing that she is Ms Calendar, and he tells her that the secret of reviving Acathla is Angelus' blood. Xander arrives and frees Giles while Spike takes Drusilla away, leaving Buffy and Angelus to fight with swords. Willow manages to restore the curse on Angel's soul, and he reverts back to his normal self. However, Acathla has begun to awake, and the only way to close the vortex is to send Angel to hell - a heart-breaking decision that Buffy is forced to make; she impales Angel and Acathla with the sword, banishing them both to the underworld. Later, homeless and expelled, Buffy boards a bus bound for Los Angeles…

Sarah Michelle Gellar (Buffy Summers), Nicholas Brendon (Xander Harris), Alyson Hannigan (Willow Rosenberg), Charisma Carpenter (Cordelia Chase), David Boreanaz (Angel), Anthony Stewart Head (Rupert Giles), Seth Green (Oz), Kristine Sutherland (Joyce Summers), James Marsters (Spike), Robia LaMorte (Ms. Calendar), Juliet Landau (Drusilla), Armin Shimerman (Principal Snyder), Max Perlich (Whistler), James G. MacDonald (Detective Stein), Susan Leslie (First cop), Thom G. Waites (Second cop)
Directed by Joss Whedon

TX (US): 19th May 1998
TX (UK - Sky One): 13th August 1999
TX (UK - BBC 2): 16th March 2000

Notes:
*Featuring Buffy, Xander, Willow, Giles, Oz, Cordelia and Angel

*Parts one and two are sometimes shown joined together as a double-length epsiode