Harry Potter and the Philosopher's StoneChapter 1
Voldemort's Defeat and Harry's Delivery
Voldemort kills James and Lily Potter but his curse rebounds on baby Harry, leaving a lightning scar and causing Voldemort's disappearance. Dumbledore, McGonagall, and Hagrid deliver Harry to the Dursleys for protection.
Outcome
Harry becomes the 'Boy Who Lived'; wizarding world celebrates Voldemort's downfall.