The famouse opera singer Violetta von Cacklefur is in Gloomeria to perform at the Royal Mousetropolitan Theater! But the mischievous phantomof the theater has an old grudge against her. It's up to Creepella and Geronimo to track him down in the theater's spooky basement... before yhe curtains rise and he ruins the show!
Creepella is about to interview the famouse Hector Spector, who has come to Mysterious Valley with his Galloping Ghost Circus. But before she can, she has a mystery on her paws - someone is playing tricks and making messes all over Cacklefur Castle! Can she put a stop to these ghastly gags?
It's a Jurassic super-emergency: Muskrat City has been invaded by a pack of ferocious dinosaurs! Superstilton's friend Proton is trapped in the Mouseum of Natural History along with Sewer Rat Tony Sludge's daughter, Elena. The Heromice and the Sewer Rats have to work together to save their friends - and the city!
Muskrat City is under attck again. The sewer Rats have created a weather-changing device that unleashes huge storms, which will likely flood the entire city! The rodents of Muskrat City have one hope: the Heromice.
Now that the terrible Tony Sludge has escaped from prison, it's up to Geronimo Superstilton and the Heromice to defend Muskrat City from the notorious Sewer Rats and stop an enormouse blackout! Will our heroes be able to defeat their enemy without risking their fur?
NOTHING IS IMPOSSIBLE FOR GERONIMO SUPERSTILTON! He helps watch over Muskrat City, ready to fight evil at all costs. He is strong... he is invincible... he is fearless! (Well, almost.) He is one of the Heromice! THE INVISIBLE THIEF The jewelers of Muskrat City are in trouble. A thief has been stealing precious diamonds, and the thief is... invisble! Can the Heromice protect Duchess Marily…
Super Swiss slices! Tony Sludge and the Sewer Rats have invented a new device - a shrink ray that can turn things tiny! Tony has a plan to use it to steal all of Muskrats City's gold. It's up to the Heromice to stop him, but they'd better be careful the Sewer Rats don't turn them into mini-mice first!
Muskrat City has been struck by a giant blackout and it's so dark, no one can see a whisker! A gang of criminal robots is robbing all of the city's jewelry stores, and it's up to Geronimo Superstilton and the Heromice to figure out who's behind the attack. Will our heroes be able to solve the mystery?
Great Gouda! Tony Sludge and the Sewer Rats have turned day into night, and they want the sun to stay away forever! Now it's up to the Heromice and the mysterious new crime fighter Super E to stop them. But can Superstilton and his friends bring daylight back to Muskrat City before it's too late?
Timeless cheese stricks! Professor Maximilian Mousemover just arrived in Muskrat City ... in a time machine! Tony Sludge's great-great -grandfather Butch Sludge is visiting from the past, too, and he's up to no good. The Heromice must travel through time to save the rodents of the past - and the future - from the Sewer Rats.