While baby-sitting for practical joker Betsy Sobak, Claudia breaks her leg as a result of one of Betsy's pranks and wants to quit the club, prompting Kristy and the other baby-sitters to teach Betsy a lesson.

Jessi recently moved to Stoneybrook and is one of the newest members of The Baby-sitters Club. She's getting ready to start regularly sitting for the BSC's newest charge, Matt Braddock. Matt has been Deaf since birth and uses sign language to communicate, so Jessi has to use it, too. It's a secret language! Soon all the neighborhood kids want to learn how to sign, which keeps the BSC busy. Jessi's the busiest of all -- she's preparing for her dance...

Mr. Nogginbody discovers that babysitting is much more difficult than he imagined, but also how much more fun it can be to act like a child than to be the grownup.

"Once in your life, sometime after your first memory but before you can drive a car, something is going to happen to you that doesn't happen to anyone else you know. It might be something good. It might be something bad, or special, or funny, or shocking. For Millie, it's something really sad. Lolo, her neighbors' infant daughter, dies -- unexpectedly, suddenly, inexplicably -- on the night Millie babysits. There's nothing she could have done. There's...

"Claudia has always been the most creative kid in her class... until Ashley Wyeth comes along. Ashley's really different: She wears hippie clothes and has multiple earrings, and she's the most fantastic artist Claudia has ever met. Ashley says Claudia is a great artist, too, but thinks she's wasting her artistic talent with The Baby-sitters Club. When Claudia starts spending more time with Ashley and missing BSC meetings, it becomes clear that Claudia...

"The kids are in for a treat when their parents leave them with an extraterrestrial babysitter"--

"After slicing the horn off of the Evil Apha Unicorn and becoming a legend, Pacey Packer returns to Rundalyn to free the statue children she left behind"--

Mayhem ensues in their sleepy California beach town when three best friends, motivated by unlimited snacks, no parents, and earning money for an epic seventh-grade party, find an old copy of "The Babysitters Club" and decide to start their own babysitting business.

Attracted to shy Mary Anne, Logan asks to become a member of the Baby-Sitters Club and gets Mary Anne as his "checker" on his trial job, but Mary Anne is plagued by a series of embarassing episodes.