Remy (Patton Oswalt) is a gourmet rat who dreams on becoming a chef one day. Until his dream will be fulfilled he passes his time by following the career of his favorite Chef - Gusteau (Brad Garrett). One day Remy finds himself in Paris and in Chef Gusteau’s restaurant with an opportunity to become a chef with the help of the garbage boy, Linguini (Lou Romano) who discovered Remy cooking talent. Now, Remy have the responsibility to help Linguini becoming a chef and help Chef Gusteau’s restaurant back to its former glory by inventing the best Ratatouille dish in all of France and the world to satisfy the mean food critic Anton Ego (Peter O'Toole).