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Harry Potter and the Chamber of Secrets
Harry returns to Hogwarts despite dire warnings from the Malfoy's excitable house elf, Dobby, only to find a menace has opened the Chamber of Secrets – home to a hideous monster with a dark history. A mysterious diary that falls into Harry's hands produces magical responses from its owner, Tom Riddle (Voldemort as a teen), and allows Harry to see into the past from Riddle's perspective. When someone swipes the diary from Harry, students start falling down petrified left and right. Harry and Ron enter the Chamber of Secrets for a showdown with Riddle and a giant basilisk (a really huge snake). With the help of Professor Dumbledore's pet phoenix and Godric Gryffindor's sword, Harry kills the basilisk and destroys the diary (and Riddle).
THE SHORT VERSION: Harry meets Dobby, kills a snake.