I, Geronimo Stilton, found myself traveling through time once again! While testing his latest time machine, Professor von Volt accidentally brought some history into the present. Tops, our triceratops friend; Helen of Troy; Attila the Hun; Charlemagne; and Christopher Columbus were all in present day New Mouse City! My friends and I climbed into the new time machine to take them back in time. But the Cheese-O Sphere wasn't working perfectly! Could we return everyone to their proper place in time and make it back in one piece?