Mrs. Bell challenges her science students to invent their own robots but when they start malfunctioning it becomes up to the DATA Set to deprogram the machines before an army of robots take over the school.

Stacey can't wait to get involved in the plans for Stoneybrook Middle School's Mischief Night Masquerade, but someone is trying to sabotage the event and Stacey and her friends in the Baby-Sitters Club are determined to find out why.

When her best friend and ex-BFF join the volleyball team, Natalie feels betrayed and, unable to find an extracurricular activity that interests her, meets a new student with the same problem and together they come up with a solution.

When middle school journalist Riley Dunne learns that an important and beloved club is being shut down, she uses the power of the pen to instigate much-needed social change.

Taking a turn caring for the class pet hamster, Marion is devastated when the hamster goes missing and she receives an anonymous letter in her locker with clues leading to a mysterious scavenger hunt.

At Unicorn University, Comet prefers making kitchen creations in the baking club to playing on the hoofball team, but she tries to do both for the sake of her friendship with Sapphire, however upcoming baking and hoofball competitions may prove to be too much for Comet.

Jamie Kelly writes in her diary about how her flawless friend, Angeline, discovers the real reason why Jamie and her best friend, Isabella, agree to join extracurricular clubs at the school.

Hope Roberts is a confident eleven-year-old girl who plans to be an astrophysicist, and who loves swimming, Galaxy Girl comic books, her best friend Sam, and her two rescue dogs (not necessarily in that order); but then she starts middle school, and suddenly she cannot seem to do anything right--even science club is a problem because she and another girl, Camilla, get stuck with the boring part of the science project that they suggested, but Hope...

Socially inept high school transfer student Hasegawa Kodaka and loner Mikazuki Yozora form a group called The Neighborhood Club in order to make friends and learn social skills.

Thanks to Dr. Bunsen's latest wacky invention, second-graders Gabriel, Laura, and Caesar, aka the DATA Set, are blasted back to the prehistoric era, where they quickly find themselves dashing from flying pterosaurs, stomping stegosaurus stampedes, and a sharp-toothed T-rex.