Geronimo Stilton


Geronimo Stilton is an Italian children's book series created by Elisabetta Dami and written under the pen name of the title character. Scholastic Corporation began publishing the English version of the series in the US in February 2004. In the UK, the English books are published by Sweet Cherry Publishing. The series focuses on the title character, a mouse who lives in New Mouse City on Mouse Island. A best-selling author in-universe, Geronimo Stilton, works as editor and publisher for the newspaper, The Rodent's Gazette. He has a younger sister named Thea Stilton, a cousin named Trap Stilton, and a nephew, nine-year-old Benjamin Stilton. Geronimo is a nervous, mild-mannered mouse who prefers a quiet life, yet keeps getting into faraway adventures with Thea, Trap, and Benjamin in both fictional and real locations. The books are written as fictional memoirs of him on these adventures. The books are designed and distributed in full color, depicting important words in the text as colored and in illustrative typefaces. In December 2025, it was announced that the book series was acquired by Italian animation studio Rainbow.
The series, combined with many spin-off series, has sold over 180 million copies worldwide and has 309 books in total. The series has also been adapted into an animated television series of the same name, theatrical shows, video games, and graphic novels.

Creation

In the 1990s, Elisabetta Dami found herself unable to have children, so she volunteered at children's hospitals to deal with that. Inspired by Patch Adams, who participates in Clown Care, she told humorous and adventurous stories starring the character of Geronimo Stilton and teaching morals to entertain patients. They appeared to love the stories, which would lead to her writing and publishing such stories.

Characters

  • Geronimo Stilton is the protagonist, and editor and publisher for The Rodent's Gazette, the most famous newspaper on New Mouse Island. He has a love of knowledge and has a strong sense of ethics and morals. Geronimo doesn't like to go on adventures with his family and friends, although he is passionate about writing adventure stories, which sell well in-universe. He was adopted by the Stilton family when he was young.
  • Thea Stilton is Geronimo's younger sister and special correspondent for The Rodent's Gazette. Thea taught a journalism class at Mouseford Academy to five mice, Nicky, Colette, Violet, Paulina, and Pamela, who would name their group after her as the Thea Sisters and chronicle adventures of their own in the Thea Stilton series. She was also adopted by the Stilton family when she was young with her biological brother, Geronimo Stilton.
  • Trap Stilton is Geronimo's cousin who travels along with him when he's called on. He is the owner of the thrift store Cheap Junk for Less and is often mentioned as a chef. He loves to tell jokes and play pranks, and often annoys Geronimo with his antics.
  • Benjamin Stilton is Geronimo and Thea's young 9-year-old nephew and often comes along with him on his many adventures.
  • William Shortpaws, also known as Cheap Mouse Willy, is the founder of The Rodent's Gazette and Geronimo's grandfather. He adopted Geronimo and Thea Stilton when they were young.
  • Aunt Sweetfur is Geronimo's aunt, who lives with Benjamin.
  • Sally Ratmousen is the main antagonist and publisher of The Daily Rat, the biggest competitor of The Rodent's Gazette. Her grandmother, Molly Ratmousen, founded The Daily Rat at the same time as The Rodent's Gazette founding.
  • Creepella von Cacklefur is an enchanting and mysterious mouse who lives in Mysterious Valley and works both as a special effects designer for scary films and haunted houses and as a journalist. She is the protagonist of her own spin-off series with the same name. She has a crush on Geronimo.
  • Professor Paws von Volt is a scientist and Geronimo's friend.
  • Hercule Poirat is Geronimo's childhood friend and the private investigator of New Mouse City, bringing him on many of his cases. He has a crush on Geronimo's sister, Thea.
  • Petunia Pretty Paws is a TV reporter and an environmentalist, whom Geronimo has a crush on. She also has a pesky niece named Bugsy Wugsy.
  • Wolfgang Wild Paws: is Petunia's twin brother and a TV producer, who is also an environmentalist.
  • Pinky Pink is Geronimo's teenage assistant editor at The Rodent's Gazette. She is an expert in computers and follows the latest trends.
  • Tina Spicytail is a skilled cook for the Stilton family.
  • Bruce Hyena is a parachutist, adventurer, and Geronimo's adventurous friend who likes to sign him up on many crazy adventures. He also has a crush on his sister, Thea.
  • Shorty Tao is Bruce Hyena's cousin, the managing editor of The Rodent's Gazette, and she has a little brother, Baby Tao.
  • The Paws family lived on a farm for many generations in the Giant Sequoia Valley, in Dolphin Bay. They are good friends with the Stiltons.
  • *Bugsy Wugsy is the daughter of John Wugsy and Furry Paws and Benjamin's best friend.
  • *Grandfather Paws is well-versed in natural sciences and once travelled the world in search of rare butterflies.
  • *Grandmother Paws at a young age, she travelled all over the world when planes were not built yet.
  • *Teddy Paws is the son of Grandfather and Grandmother Paws and brother of Bobby Paws.
  • *Jenny Littlepaw is Teddy's wife.
  • *Tom Paws is the son of Teddy and Jenny.
  • *Lucy Vally is Tom's wife.
  • *Lilly, Lally, and Lolly Paws are the daughters of Lucy and Tom. Lilly is five, Lally is seven, and Lolly is eleven.
  • *Bobby Paws is the son of Grandfather and Grandmother Paws and brother of Teddy Paws.
  • *Suzy Rattella is Bobby's wife.
  • *Furry Paws is the daughter of Bobby and Suzy and sister of Petunia and Wolfgang.
  • *John Wugsy is Furry's husband.
  • The Shadow is a recurring antagonist, Sally Ratmousen's cousin and one of Mouse Island's most notorious criminals. She is a master thief and master of disguise who usually seduces Geronimo during their encounters.
  • Champ Strongpaws is a friend of Geronimo who also likes to sign him up for adventures.
  • Kornelius von Kickpaw, code name OOK, is Geronimo's childhood friend and a secret agent for the government of Mouse Island. He has a sister, Veronica von Kickpaw, who is also a secret agent and works under the code name OOV.
  • Wild Willie is an archaeologist and adventurous friend of Geronimo and Bruce Hyena. He takes Geronimo on some adventures.
  • Madame No is a recurring antagonist in the later books. She is the greedy, wealthy CEO of EGO Corp whose criminal endeavors often lead to her clashing with Geronimo and his friends.

    Books

Not all books and spin-off series are listed. The following lists are of ones that have been or are planned to be released in English.

''Geronimo Stilton''

  1. Lost Treasure of the Emerald Eye
  2. The Curse of the Cheese Pyramid
  3. Cat and Mouse in a Haunted House
  4. I'm Too Fond of My Fur!
  5. Four Mice Deep in the Jungle
  6. Paws Off, Cheddarface!
  7. Red Pizzas for a Blue Count / Fangs and Feasts in Transratania
  8. Attack of the Bandit Cats / Attack of the Pirate Cats
  9. A Fabumouse Vacation for Geronimo / A Fabumouse Holiday for Geronimo
  10. All Because of a Cup of Coffee / Hang on to Your Whiskers
  11. It's Halloween, You 'Fraidy Mouse!
  12. Merry Christmas, Geronimo!
  13. The Phantom of the Subway / The Ghost of the Underground
  14. The Temple of the Ruby of Fire / The Temple of the Fire Ruby
  15. The Mona Mousa Code
  16. A Cheese-Colored Camper / A Cheese-Colored Camper Van
  17. Watch Your Whiskers, Stilton! / The Mystery of the Roaring Rat
  18. Shipwreck on the Pirate Islands / Shipwreck on Pirate Island
  19. My Name Is Stilton, Geronimo Stilton
  20. Surf's Up, Geronimo!
  21. The Wild, Wild West
  22. The Secret of Cacklefur Castle
  23. Valentine's Day Disaster
  24. Field Trip to Niagara Falls / School Trip to Niagara Falls
  25. The Search for Sunken Treasure
  26. The Mummy with No Name
  27. The Christmas Toy Factory
  28. Wedding Crasher
  29. Down and Out Down Under
  30. The Mouse Island Marathon
  31. The Mysterious Cheese Thief
  32. Valley of the Giant Skeletons
  33. Geronimo and the Gold Medal Mystery
  34. Geronimo Stilton, Secret Agent
  35. A Very Merry Christmas
  36. Geronimo's Valentine
  37. The Race Across America
  38. A Fabumouse School Adventure / A Fantastic School Adventure
  39. Singing Sensation
  40. The Karate Mouse
  41. Mighty Mount Kilimanjaro
  42. The Peculiar Pumpkin Thief
  43. I'm Not a Supermouse!
  44. The Giant Diamond Robbery
  45. Save the White Whale!
  46. The Haunted Castle
  47. Run for the Hills, Geronimo!
  48. The Mystery in Venice
  49. The Way of the Samurai
  50. This Hotel Is Haunted!
  51. The Enormouse Pearl Heist
  52. Mouse in Space!
  53. Rumble in the Jungle
  54. Get Into Gear, Stilton!
  55. The Golden Statue Plot
  56. Flight of the Red Bandit
  57. The Stinky Cheese Vacation
  58. The Super Chef Contest
  59. Welcome to Moldy Manor
  60. The Treasure of Easter Island
  61. Mouse House Hunter
  62. Mouse Overboard!
  63. The Cheese Experiment
  64. Magical Mission
  65. Bollywood Burglary
  66. Operation: Secret Recipe
  67. The Chocolate Chase
  68. Cyber-Thief Showdown
  69. Hug a Tree, Geronimo
  70. The Phantom Bandit
  71. Geronimo on Ice!
  72. The Hawaiian Heist
  73. The Missing Movie
  74. Happy Birthday, Geronimo!
  75. The Sticky Situation
  76. Superstore Surprise
  77. The Last Resort Oasis
  78. The Mysterious Eye of the Dragon
  79. Garbage Dump Disaster
  80. Have a Heart, Geronimo
  81. The Super Cup Faceoff
  82. Mouse VS Wild
  83. Treasures of the Maya
  84. Blast From The Past
  85. ''The Legend of Chocolate Hills''

    ''Geronimo Stilton: Special Edition''

  86. A Christmas Tale
  87. Christmas Catastrophe
  88. The Hunt for the Golden Book
  89. The Hunt for the Curious Cheese
  90. The Hunt for the Secret Papyrus
  91. The Hunt for the Hundredth Key
  92. ''The Hunt for the Colosseum Ghost''

    ''Geronimo Stilton: Mini Mystery''

  93. The Super Scam
  94. The Lake Monster
  95. The Mouse Hoax
  96. The Cat Gang
  97. The Double Cross
  98. ''The Cheese Burglar''

    Anniversary Edition

  99. The Little Book of Happiness
  100. The Secret World of Geronimo Stilton

    ''The Kingdom of Fantasy''

The series chronicles Geronimo's adventures as a knight in a magical world known as the Kingdom of Fantasy. Each story is a dream and is bookended by Geronimo Stilton in his original world, living in Mouse Island.
  1. The Kingdom of Fantasy
  2. The Quest for Paradise: The Return to the Kingdom of Fantasy
  3. The Amazing Voyage: The Third Adventure in the Kingdom of Fantasy
  4. The Dragon Prophecy: The Fourth Adventure in the Kingdom of Fantasy
  5. The Volcano of Fire: The Fifth Adventure in the Kingdom of Fantasy
  6. The Search for Treasure: The Sixth Adventure in the Kingdom of Fantasy
  7. The Enchanted Charms: The Seventh Adventure in the Kingdom of Fantasy
  8. The Hour of Magic: The Eighth Adventure in the Kingdom of Fantasy|The Hour of Magic: The Eighth Adventure in the Kingdom of Fantasy
  9. The Wizard's Wand: The Ninth Adventure in the Kingdom of Fantasy
  10. The Ship of Secrets: The Tenth Adventure in the Kingdom of Fantasy
  11. The Guardian of the Realm: The Eleventh Adventure in the Kingdom of Fantasy
  12. The Island of Dragons: The Twelfth Adventure in the Kingdom of Fantasy
  13. The Battle for Crystal Castle: The Thirteenth Adventure in the Kingdom of Fantasy
  14. The Keepers of the Empire: The Fourteenth Adventure in the Kingdom of Fantasy
  15. The Golden Key: The Fifteenth Adventure in the Kingdom of Fantasy
  16. The Treasures of the Kingdom: The Sixteenth Adventure in the Kingdom of Fantasy
  17. The Midnight Heist: The Seventeenth Adventure in the Kingdom of Fantasy

    ''The Kingdom of Fantasy: Special Edition''

  18. The Phoenix of Destiny: An Epic Kingdom of Fantasy Adventure
  19. ''The Dragon of Fortune: An Epic Kingdom of Fantasy Adventure''

    ''Adventure Camp Published in Italian only''

  20. A Night Under the Stars
  21. Courage at High Altitude
  22. Challenge Along the River
  23. Sea Turtle Mission
  24. Mountain Bike Explorers
  25. ''The Adventure Manual''

    ''Thea Stilton''

The series is aimed toward female audiences and focuses on the "Thea Sisters", a group of five friends who are from different continents and were the students of Thea Stilton. Each story involves the Thea Sisters solving a mystery together and the book highlights the clues, to help the reader follow along as detectives.
  1. Thea Stilton and the Dragon's Code
  2. Thea Stilton and the Mountain of Fire
  3. Thea Stilton and the Ghost of the Shipwreck
  4. Thea Stilton and the Secret City
  5. Thea Stilton and the Mystery in Paris
  6. Thea Stilton and the Cherry Blossom Adventure
  7. Thea Stilton and the Star Castaways
  8. Thea Stilton: Big Trouble in the Big Apple
  9. Thea Stilton and the Ice Treasure
  10. Thea Stilton and the Secret of the Old Castle
  11. Thea Stilton and the Blue Scarab Hunt
  12. Thea Stilton and the Prince's Emerald
  13. Thea Stilton and the Mystery on the Orient Express
  14. Thea Stilton and the Dancing Shadows
  15. Thea Stilton and the Legend of the Fire Flowers
  16. Thea Stilton and the Spanish Dance Mission
  17. Thea Stilton and the Journey to the Lion's Den
  18. Thea Stilton and the Great Tulip Heist
  19. Thea Stilton and the Chocolate Sabotage
  20. Thea Stilton and the Missing Myth
  21. Thea Stilton and the Lost Letters
  22. Thea Stilton and the Tropical Treasure
  23. Thea Stilton and the Hollywood Hoax
  24. Thea Stilton and the Madagascar Madness
  25. Thea Stilton and the Frozen Fiasco
  26. Thea Stilton and the Venice Masquerade
  27. Thea Stilton and the Niagara Splash
  28. Thea Stilton and the Riddle of the Ruins
  29. Thea Stilton and the Phantom of the Orchestra
  30. Thea Stilton and the Black Forest Burglary
  31. Thea Stilton and the Race for the Gold
  32. Thea Stilton and the Rainforest Rescue
  33. Thea Stilton and the American Dream
  34. Thea Stilton and the Roman Holiday
  35. Thea Stilton and the Fiesta in Mexico
  36. Thea Stilton and the Cave of Stars
  37. Thea Stilton and the Ghost of the Woods
  38. Thea Stilton and the Search for the Secret Garden
  39. ''Thea Stilton and the Blue Island Thief''

    ''Thea Stilton: Special Edition''

  40. The Journey to Atlantis
  41. The Secret of the Fairies
  42. The Secret of the Snow
  43. The Cloud Castle
  44. The Treasure of the Sea
  45. The Land of Flowers
  46. The Secret of the Crystal Fairies
  47. The Dance of the Star Fairies
  48. ''The Magic of the Mirror''

    ''Thea Stilton Mouseford Academy''

  49. Drama at Mouseford
  50. The Missing Diary
  51. Mouselets in Danger
  52. Dance Challenge
  53. The Secret Invention
  54. A Mouseford Musical
  55. Mice Take the Stage
  56. A Fashionable Mystery
  57. The Mysterious Love Letter
  58. A Dream on Ice
  59. Lights, Camera, Action!
  60. Mice on the Runway
  61. Sea Turtle Rescue
  62. The Secret Notebook
  63. The Friendship Recipe
  64. The Royal Ball
  65. The Puppy Problem
  66. The Secret of the Butterflies
  67. The Missing Mirror
  68. ''The Sweetest Dream''

    ''Thea Stilton and the Treasure Seekers''

  69. The Treasure Seekers
  70. The Compass of the Stars
  71. ''The Legend of the Maze''

    ''Creepella von Cacklefur''

This series follows Creepella von Cacklefur, one of the recurring characters of the main series. Each book begins and ends with Geronimo Stilton: Creepella writes and illustrates each story and sends the manuscript to Geronimo, asking that he publish it. Some of the stories involve Geronimo, i.e., Creepella and Geronimo visit the fun fair together in Ride for Your Life!.
  1. The Thirteen Ghosts
  2. Meet Me in Horrorwood
  3. Ghost Pirate Treasure
  4. Return of the Vampire
  5. Fright Night
  6. Ride for Your Life!
  7. A Suitcase Full of Ghosts
  8. The Phantom of the Theater
  9. ''The Haunted Dinosaur''

    ''Cavemice''

The series focuses on Geronimo's ancestor, Geronimo Stiltonoot, in the Stone Age where dinosaurs co-exist with mice and prehistoric mammals.
  1. The Stone of Fire
  2. Watch Your Tail!
  3. Help, I'm in Hot Lava!
  4. The Fast and the Frozen
  5. The Great Mouse Race
  6. Don't Wake the Dinosaur!
  7. I'm a Scaredy-Mouse!
  8. Surfing for Secrets
  9. Get the Scoop, Geronimo!
  10. My Autosaurus Will Win!
  11. Paws Off the Pearl!
  12. The Smelly Search
  13. Shoo, Caveflies!
  14. ''A Mammoth Mystery''

    ''Spacemice''

The series is set in a parallel universe based on space opera, featuring Geronimo Stiltonix as the captain of the entire spaceship MouseStar1.
  1. Alien Escape
  2. You're Mine, Captain!
  3. Ice Planet Adventure
  4. The Galactic Goal
  5. Rescue Rebellion
  6. The Underwater Planet
  7. Beware! Space Junk!
  8. Away in a Star Sled
  9. Slurp Monster Showdown
  10. Pirate Spacecat Attack
  11. We'll Bite Your Tail, Geronimo!
  12. ''The Invisible Planet''

    ''Heromice''

The series focuses on Geronimo Superstilton and the Heromice, a team of superheroes who live in Muskrat City and watch over the crimes prevailing in the city.
  1. Mice to the Rescue!
  2. Robot Attack
  3. Flood Mission
  4. The Perilous Plants
  5. The Invisible Thief
  6. Dinosaur Danger
  7. Time Machine Trouble
  8. Charge of the Clones
  9. Insect Invasion
  10. Sweet Dreams, Sewer Rats!
  11. ''Revenge of the Mini-Mice!''

    ''Micekings''

The series is set in the Viking Age and stars Geronimo Stiltonord, who lives in the village of Mouseborg and faces fiery, mouse-eating dragons every day.
  1. Attack of the Dragons
  2. The Famouse Fjord Race
  3. Pull the Dragon's Tooth!
  4. Stay Strong, Geronimo!
  5. The Mysterious Message
  6. The Helmet Holdup
  7. The Dragon Crown
  8. ''The Great Miceking Stone''

    ''The Journey Through Time''

  9. The Journey Through Time
  10. Back in Time: The Second Journey Through Time
  11. The Race Against Time: The Third Journey Through Time
  12. Lost in Time: The Fourth Journey Through Time
  13. No Time to Lose: The Fifth Journey Through Time
  14. The Test of Time: The Sixth Journey Through Time
  15. Time Warp: The Seventh Journey Through Time
  16. ''Out of Time: The Eighth Journey Through Time''

    ''Classic Tales''

The series are adaptations of public domain literature with anthropomorphic mouse characters.
  1. Treasure Island
  2. Little Women
  3. Around the World in Eighty Days
  4. The Wonderful Wizard of Oz
  5. Alice in Wonderland
  6. Moby Dick
  7. The Secret Garden
  8. Gulliver's Travels
  9. A Christmas Carol
  10. Journey to the Center of the Earth
  11. 20,000 Leagues Under the Sea
  12. The Jungle Book
  13. ''Mystery of Frankenstein''

    ''Thea Stilton Classic Tales''

  14. Romeo and Juliet
  15. Pride and Prejudice
  16. A Midsummer Night's Dream
  17. ''The [Phantom of the Opera (novel)|The Phantom of the Opera]''

    Graphic novels

The English translations of the graphic novels are published by Papercutz.
  1. The Discovery of America
  2. The Secret of the Sphinx
  3. The Coliseum Con
  4. Following the Trail of Marco Polo
  5. The Great Ice Age
  6. Who Stole the Mona Lisa?
  7. Dinosaurs in Action
  8. Play It Again, Mozart!
  9. The Weird Book Machine
  10. Geronimo Stilton Saves the Olympics
  11. We'll Always Have Paris
  12. The First Samurai
  13. The Fastest Train in the West
  14. The First Mouse on the Moon
  15. All for Stilton, Stilton for All!
  16. Lights, Camera, Stilton!
  17. The Mystery of the Pirate Ship
  18. First to the Last Place on Earth!
  19. Lost in Translation
  20. ''Saving Liberty''

    ''Thea Stilton'' graphic novels

  21. The Secret of Whale Island
  22. Revenge of the Lizard Club
  23. The Treasure of the Viking Ship
  24. Catching the Giant Wave
  25. The Secret of the Waterfall In The Woods
  26. The Thea Sisters and the Mystery At Sea
  27. A Song for the Thea Sisters
  28. ''The Thea Sisters and the Secret Treasure Hunt''

    ''Geronimo Stilton Reporter''

Taking the place of the original graphic novels, the Geronimo Stilton Reporter series are adaptations of episodes from the Geronimo Stilton animated series, which ended the year before the first entry was published. Published by Papercutz.
  1. Operation Shufongfong
  2. It's My Scoop!
  3. Stop Acting Around!
  4. The Mummy with No Name
  5. Barry the Moustache
  6. Paws Off, Cheddarface!
  7. Going Down to Chinatown
  8. Hypno Tick-Tock
  9. Mask of the Rat-Jitsu
  10. Blackrat’s Treasure
  11. Mystery on the Rodent Express
  12. Mouse House of the Future
  13. Reported Missing
  14. The Gem Gang
  15. Clean Sweep
  16. Mr. and Mrs. Matched
  17. Top Model Thea
  18. Attack of the Killer Whale
  19. Cheese Connection
  20. Starring Geronimo
  21. '' Rules of the Game''

    ''Geronimo Stilton the Graphic Novel''

The graphic novels are illustrated by Tom Angleberger. The illustrations are in a different style to the other graphic novels - longer books but with fewer words per page and very short chapters. The series is endorsed by Dav Pilkey, creator of the Dog Man series.
  1. The Sewer Rat Stink
  2. Slime for Dinner
  3. Great Rat Rally
  4. ''Last Ride at Luna Park''

    Reception

Publishers Weekly review of Lost Treasure of the Emerald Eye praised the book for its fast pace, chapter format, full-color design, and usage of colored typefaces. Kirkus Reviews review of the Special Edition book The Hunt for the Hundredth Key states that "the simplistic mysteries and silly jokes are in line with other series outings, 'special edition' status notwithstanding." Its review of Geronimo on Ice! found it to be average, criticizing the plot holes, and remarks that it "skates by without landing any impressive tricks."
Kirkus Reviews reviews of Cavemice entry The Stone of Fire and Spacemice entry Alien Escape were positive, albeit criticized the slow pacing at the beginning of the former. Its review of Creepella Von Cacklefur entry Fright Night felt the plot wasn't "the strongest of Stilton spinoffs". Its review of The Kingdom of Fantasy entry The Enchanted Charms was mixed, criticizing the plot for not being original and appealing enough, but praising the art and incorporation of puzzles.

Other media

Two English-language eBooks, Geronimo Stilton's Illustrated Tails and Geronimo Stilton's Humorous Tails with the Secret Portrait Gallery, were published by Edizioni Piemme and sold by CyberRead and Barnes & Noble in 2000. The eBooks were part of a collaboration with Microsoft. The books Il mio primo manuale di internet, Trentino: Una Provincia Speciale!, and Il piccolo libro della pace were also adapted into eBooks. Piemme released the eBooks at the Frankfurt eBook Awards.
There are also audiobooks of the Geronimo Stilton books published by Scholastic Audio Books, available on CD and as downloadables through various services such as OverDrive and Audible. There are three stories in the first three collections, book 10 is sold by itself, and the remaining books are sold in pairs. Books 1 through 10 are read by Edward Herrmann. Books 11–18, 20–22 and 24, and 25–26 are read by Bill Lobley.

Television series

In 1999, a pilot episode for an animated series of the same name, with two seasons each consisting of 26 episodes, was created by Stranemani, Graphilm, MatitAnimatA and Gertie Productions. It was directed and storyboarded by Marco A. Zanoni, written by Carlotta Mastrangelo, and animated by Federico Panella and Stefania Gallo. In 2000–2001, the series was reported to be in development at Carrère Group, in co-production with Gertie, Les Films de la Perrine, Red Whale and RAI. The series was set for broadcast on Rai 2 in 2004. Many animators and artists participated in the series' production, including Annetta Zucchi and Bruno Olivieri. The voice of Geronimo in this series was provided by Francesco Lovati. A theme song for the series was recorded by I Piccoli Cantori di Milano.
Another animated series debuted in Italy on 15 September 2009. The show ran for 78 episodes across three seasons with the series finale airing on 28 February 2017.

Theatre

The Kingdom of Fantasy series has been developed into a musical theatre show, which has been performed in Spanish in Barcelona, Spain, in Dutch in Hong Kong and the Netherlands, in Dutch and Flemish in Belgium, and in both English and French in Montreal, Canada.
In 2016, Oregon Children's Theatre produced Geronimo Stilton: Mouse in Space, a world-premiere adaptation of Mouse in Space! by John Maclay, and the first live-action production of Geronimo Stilton media in the United States. The production was performed in Canada in 2018.

Video games

partnered with Virtual Toys to develop two video games based on The Kingdom of Fantasy series for PlayStation Portable. The first, Geronimo Stilton in the Kingdom of Fantasy, was released in Europe on 3 November 2011. The follow-up, Geronimo Stilton: Return to the Kingdom of Fantasy, was released in the continent on 31 October 2012. In North America, both titles were released exclusively on the PlayStation Store on 16 July 2013.

Quiz show

A quiz show named Topo Quiz con Geronimo Stilton was broadcast on Sky Italia and RaiSat in 2005–2008. The show, hosted by Geronimo and a presenter named Gaia, covered environmental topics, nutrition, road safety, and general life studies. Each episode would involve a team of two competing with each other. The show was directed by D. Di Santo. A talk show, Giga blu, was also broadcast on RaiSat around this time.

Film

A film based on Geronimo Stilton has been in development since 2002.
In February 2023, Radar Pictures acquired the rights to make a feature film based on Geronimo Stilton. The film is a co-production between Radar and Italian company Atlantyca Entertainment, which also produced the television series, with DreamWorks Animation veteran David Soren attached to write and direct and Anthony Tringali, Michael Napoliello and Maria Frisk set to produce under Radar Pictures.