In Harry Potter and the Sorcerer's Stone, Harry, an orphan, lives with the Dursleys, his horrible aunt and uncle, and their abominable son, Dudley. One day just before his eleventh birthday, an owl tries to deliver a mysterious letter-the first of a sequence of events that end in Harry meeting a giant man named Hagrid. Hagrid explains Harry's history to him: When he was a baby, the Dark wizard, Lord Voldemort, attacked and killed his parents in an attempt to kill Harry; but the only mark on Harry was a mysterious lightning-bolt scar on his forehead. Now he has been invited to attend Hogwarts School of Witchcraft and Wizardry, where the headmaster is the great wizard Albus Dumbledore. Harry visits Diagon Alley to get his school supplies, especially his very own wand. To get to school, he takes the Hogwarts Express from platform nine and three-quarters at King's Cross Station. On the train, he meets two fellow students who will become his closest friends: Ron Weasley and Hermione Granger. Harry is assigned to Gryffindor House at Hogwarts, and soon becomes the youngest-ever Seeker on the House Quidditch team. He also studies Potions with Professor Severus Snape, who displays a deep and abiding dislike for Harry, and Defense Against the Dark Arts with nervous Professor Quirrell; he and his friends defeat a mountain troll, help Hagrid raise a dragon, and explore the wonderful, fascinating world of Hogwarts. But all events lead irrevocably toward a second encounter with Lord Voldemort, who seeks an object of legend known as the Sorcerer's Stone.