When Rosie is unable to invent a contraption to help one of Aunt Rose's Raucous Riveters friends, she calls on classmates Iggy Peck and Ada Twist to help.

Luthor the Doberman, a former attack dog, has a good home with Savannah Drysdale, but every time a certain truck passes he goes into a frenzy, while Griffin Bing is caught up in trying to beat his rival, Darren Vader, at an invention contest.

Where some people see rubbish, Rosie Revere sees inspiration. Alone in her room at night, shy Rosie constructs great inventions from odds and ends. Hot dog dispensers, helium pants, python-repelling cheese hats: Rosie's gizmos would astound - if she ever let anyone see them. Afraid of failure, she hides them away under her bed. Until a fateful visit from her great-great-aunt Rose who shows her that a first flop isn't something to fear - it's something...

With the Board of Inspectors threatening to shut down Rotten School, Bernie Bridges only has time for one last money-making scheme, but his friends are too obsessed with a role-playing video game to help him.

"A.J. and the gang from Ella Mentery School start a company to sell their brand new invention--a heated, scented, talking toilet seat!"--

"Nick and his friends race against their foes to retrieve more pieces of Tesla's free energy transmitter, only to see them fall into the hands of the Accelerati's shadowy leader"--

When a very important inventor needs rescuing, Freddie Ramos activates his special sneakers and becomes a superhero.

In order to save their school, best friends Pearl, Millie, and Halinka invent a special hat that gives its wearer perfect hair, an expanded vocabulary, and more confidence, but they need to take action when a rival school steals their idea.

Bit-Con, one of the Snot-Bots created by a radiation leak at the nuclear power plant, is sent by their leader, Sludge, to infiltrate the Clean Team and make a mess of the city of Electropolis.

Sludge plans to use millions of small Fart-bots to foul the air over Electropolis with a giant smelly cloud of gas.