Hermione Granger Slughorns Party Dress

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Hermione first appears in Harry Potter and the Philosopher's Stone when she meets Harry and Ron on the Hogwarts Express, where she mocks Ron for his inability to perform a spell to turn his rat yellow. She proves just how much she knows by declaring that she memorized all the textbooks by heart and by performing the "oculus" spell on Harry to fix his broken glasses. She constantly annoys her peers with her knowledge, so Harry and Ron initially consider her arrogant, especially after she criticises Ron's incantation of the Levitation Charm. They heartily dislike her until they rescue her from a troll, for which she is so thankful that she lies to protect them from punishment, thus winning their friendship. Hermione's knack for logic later enables the trio to solve a puzzle that is essential to retrieving the Philosopher's Stone, and she defeats the constrictive Devil's Snare plant by summoning a jet of "bluebell flame". The scene in which Hermoine solves the puzzle during the enterance to the Philosopher's Stone was not included in the movie.