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The Pirate Cats have had their plans foiled by Geronimo Stilton time and time again, due to the help from Geronimo's friend Professor Volt. The Pirate Cats decide to better their odds by getting rid of Professor Volt; kidnapping him and leaving him in the Cretaceous Period - a time when the earth was occupied by dinosaurs.

Everyone's favorite time-traveling mouse has to rescue the Rosetta Stone from the clutches of the evil Pirate Cats.

Thanks to one of the Lumiere brothers' first screenings, Paris in 1896 is the site of a historic event: the birth of motion pictures. The Pirate Cats go back in time to steal the brilliant invention, the cinematograph, in order to go down in history as the inventors of the movies! Can Geronimo and his friends thwart the Cats' evil plans?