Angel

In which Buffy learns more about the tall, mysterious stalker in her life. C'mon, Buffy, if he was really dangerous would he be lurking in dark alleys?

Official back-of-box synopsis:

Buffy finds herself irresistibly drawn to the mysterious Angel, but must pull herself away when she uncovers his terrible secret and ungodly past.

From the old WB Buffy website:

LOVE STINKS -- While Buffy grows more and more annoyed with Angel's mysterious disappearing act, she can't deny her growing obsession with him. Meanwhile, it's killing Xander that Buffy doesn't have a clue how he feels about her and, as he vents his frustrations to Willow, she knows all too well how he feels. And in the underworld, The Master is incensed that Buffy has taken the lives of so many members of his family, and he summons warrior vampires to annihilate her.

Links:

This episode's page at http://www.restlessbtvs.com/, the Restless BTVS Trivia Guide

This episode's page at http://www.vrya.net/bdb/, the Buffyverse Dialog Database

Cross-reference:

episodes in which Angel suffers chest-trauma:

• What's My Line? (part 2)
  Dru sprinkles him with holy water to see the pretty colours...
• The Wish
  Vamp!Xander and Vamp!Willow torture him with matches
• this episode
  Buffy's cross burns him but he takes it without flinching

Cast:

• Sarah Michelle Gellar as Buffy
• Alyson Hannigan as Willow
• Nicholas Brendon as Xander
  

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• Anthony Stewart Head as Giles
• Charisma Carpenter as Cordelia
• Mark Metcalf as The Master
• David Boreanaz as Angel
• Kristine Sutherland as Joyce
• Julie Benz as Darla
• Andrew Ferchland as The Anointed One
• Charles Wesley as Meanest Vamp