Sailor Moon's Adventures of Ratatouille is the first episode of Season 2 of the SM Adventures Series, and the beginning of the Makaiju Arc.
Although Maleficent and her Hellfire Organization have been defeated, a new evil has arrived to take their place in the form of the evil Emperor Zurg and his Makaiju servants, who wish to conquer Earth in order to set it up as a future base of operations for their twisted scientific experiments. Sailor Moon must unite with the other Senshi to take down this threat before it consumes the universe in mad fury.
Remy is an idealistic and ambitious young rat, gifted with highly developed senses of taste and smell. Inspired by his idol, the recently deceased chef Auguste Gusteau, Remy dreams of becoming a cook himself. When a woman sees his clan, they are forced to abandon their home; Remy is separated from them as a result of the woman's gunshots. He ends up in the sewers of Paris and eventually finds himself at a skylight overlooking the kitchen of Gusteau's restaurant.
As Remy watches, a young man named Alfredo Linguini is hired as a garbage boy by Skinner, the restaurant's devious current owner and Gusteau's former sous-chef. When Linguini spills a pot of soup and attempts to recreate it with disastrous results, Remy falls into the kitchen and cooks the soup to perfection rather than escaping. Linguini catches Remy and is confronted by Skinner. As Skinner yells at Linguini, the soup is accidentally served and proves to be a success. Colette Tatou, the staff's only female chef, convinces Skinner to retain Linguini, who is assumed to be the soup's creator. After Skinner catches Remy in the act of escaping, he orders Linguini to kill him, but he cannot do it. Linguini then discovers Remy's intelligence and passion for food, so he keeps him.