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1 - Exposition. Remy is sneaking into a human's house when he discovers cooking, and Gusto. The "Greatest" chef in the world.
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2 - Exposition. While trying to cook, Remy learns of Gustos death. The human finds Remy and tries to kill him. while trying to catch Remy, the ceiling collapses revealing his colony.
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3 - Exposition. While trying to escape, Remy gets separated from his colony. He goes out of the sewer pipes and finds that he is in Paris.
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4 - Exposition. Linguini tries get job at Gusto's. He gives a letter from his "Mother" to the head chef. The chef hires him as a garbage boy.
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5 - Rising Action. Linguini messes up a soup when he is not supposed to be cooking. Remy fixes the soup and impresses a food critic.
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6 - Rising Action. The kitchen finds Remy, and has Linguini take him away. Linguini finds out that Remy understands English. He learns that he can cook and takes him home.
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7 - Rising Action. Remy and Linguini try to remake the soup but have no way to communicate. They go back home and devise a method were Remy sit under Linguini hat and pull on his hair to control him.
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8 - Rising Action. While Linguini is on a motorcycle bike ride with Collete, Remy falls out of his hat. He finds out that his colony is also living in Paris, and want him back, but he wants to stay with Linguini.
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9 - Rising Action. Remy discovers that Linguini is the son of Gusto. He is found by the head chef and chased around Paris. Remy makes it back to gusto's first and leaves the papers for Linguini to discover. The Head chef is fired, and Linguini becomes head chef.
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10 - Rising Action. Ego the food critic sees that Gusto's is becoming popular again and goes there. Here threatens that he will order the next day.
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11 Climax - Ego comes to Gusto's and ask for the Chefs best shot. Linguini doesn't know what to do, because Remy isn't there. Remy peeks through the door and the whole kitchen tries to catch him, but Linguini stops them. He explains how Remy does the cooking, not him. All of the chefs walk out on him.
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Remy gets his whole family to help him make a dish for Ego. They make Ratatouille and Ego loves it. He asks to see the chef, but Linguini won't show him until everyone else has left.
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13 - Climax. Ego asks to meet the chef. He has to wait until everyone else has left. When he meets Remy, He just thank the for the meal and leaves.
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14 - Falling Action. When Ego leaves, he goes home and rates Gusto's. He doesn't have a negative view. He says he really enjoyed it. He doesn't tell that there were rats cooking.
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15 - Resolution. When the information that rats were making food at Gusto's, it eats shut down. Remy and Linguini and Collete make a new restaurant called ratatouille. Ego loses his job as a food critic, but he eats at Ratatouilles.