Princess Sterling sends the Dragon of the Rainbow and Scribblehopper to bring Geronimo Stilton back the the Kingdom of Fantasy, because he is the hero in the dragon prophecy who will find the stolen dragon egg and restore harmony to the kingdom.

Geronimo joins the effort to rescue Blossom, Queen of the Fairies, who has been kidnapped by the Queen of the Witches and taken to the Kingdom of Nightmares.

"Geronimo Stilton's ancient ancestor Geronimo Stiltonoot is back in another prehistoric adventure! It's the night of the big Cavemouse Idol competition, but Geronimo Stiltonoot isn't there. He has a cold, and goes to bed early. So when it's discovered that the contest's valuable grand prize has been stolen, Geronimo is the main suspect! He must prove his innocence . . . or he'll end up in enormouse trouble!" --

"Geronimo takes a vacation to the Camel Oasis!"--

Selected by the mayor to give a special driving demonstration, Geronimo Stilton realizes his driver's license has expired and he must do everything he can to pass the test again, learn about a new robot car, and catch a thief.

"Professor Greenfur, the onboard scientist on spaceship MouseStar 1, has changed color from green to--orange! What's going on? To find out, the spacemice travel to his home planet of Photosyntheson. There, they learn that all of Professor Greenfur's relatives are being threatened by the nibblix, tiny aliens with very sharp teeth! Can the spacemice help in time?" --

When their cousin is stung by a cavefly and falls into a deep sleep, Geronimo and Thea set out in search of the rare pink stinkrose, whose petals are thought to provide a cure.

While Geronimo Stilton is on his way to New York City to meet his family for the holidays, his luggage gets switched with another mouse's, and he must scurry all over the Big Apple trying to find all his presents.