A notoriously scary ghost is supposed to haunt the ruined medieval castle where Sunny and his friends are spending the day. But when a troubling visitor arrives at the antique shop, it turns out the danger is closer to home than they thought . . .

All Josh and Danny Phillips want to do is play in the yard with their dog, like regular eight-year-olds. Unfortunately, their crazy neighbor Miss Potts makes sure that they never have any fun. When the boys accidentally stumble on Miss Potts's secret—that she is working on experiments that change people into bugs—they find themselves in a whole lot of trouble. (They also find themselves with six more legs than normal.) Can the boys survive in the world as spiders? And more important, will ...

When Petty Potts leaves town, she puts Danny and Josh in charge of some of her special S.W.I.T.C.H. spray. But leave it up to the nutty scientist to put S.W.I.T.C.H. spray in a bottle identical to their sister Jenny's hairspray. When Danny and Josh's big, annoying sister transforms into a little, annoying crane fly, it's up to the two of them to keep Jenny from being eaten alive. But that would be much easier to do if their own legs would stop falling off!

"Fans of Megan McDonald's Stink, Tedd Arnold's Fly Guy, or Dan Gutman's My Weird School series will enjoy these books."— School Library JournalMad scientist Petty Potts has turned twins Josh and Danny into grasshoppers, beetles, and more with her top-secret experiments—and now, the three of them are waltzing over to the zoo to try out an awesome spray that turns them into anacondas!But when Petty wanders off, the brothers...

Josh and Danny are stuck in Princess Land—a store full of pink toys and worse: actual girls! To avoid security guards and screeching girls, the twins try a quick spritz of the infamous S.W.I.T.C.H. formula. But the spray only half-works! They are stuck with the head of a lizard and the body of a boy. Then their situation takes a nasty turn...

Danny and Josh were having a great day until Tarquin, the most annoying boy in the neighborhood, came over to play. He dresses like he's 55, doesn't do anything fun, and pulls the legs off of bugs. The twins thought that their day couldn't get any worse, but when they turn into ants by accident, they realize how wrong they were! Can Danny and Josh find a safe place to hide until they turn human again? And with Tarquin in the garden, will they make it out with all of their legs?

Petty Potts, scientist extraordinaire, is losing her touch. The S.W.I.T.C.H. spray that's supposed to turn Josh and Danny into chameleons refuses to work. But the next day at school, the twins suddenly find themselves transformed. Looks like Petty's spray has worked after all! But it shows no sign of wearing off any time soon...

Danny and Josh thought that today would be just like any other school day—wake up, eat breakfast, and go to school. Of course, they didn't expect to accidentally turn into grasshoppers in the middle of class! Can they avoid being eaten while they search for the antidote? Will they be able to change back before getting a week of detention? And will they find time to eat those delicious-looking leaves?

When Danny's soccer practice is canceled, he's forced to go with his brother, Josh, to a meeting for a wildlife and nature group. But a fluke encounter with a muffin turns both brothers into beetles just in time to learn all about pond-dipping...from the bug's perspective! Can Danny and Josh avoid becoming part of an insect collection? And where in the world is that horrible smell coming from?

Danny and Josh are trying their best to stay away from Petty Potts. They don't want anything to do with her crazy top-secret experiments, and they certainly don't want to get turned into bugs again! But when their mom's garden is ruined the day before the big neighborhood competition, the twins turn into bluebottle houseflies to take matters into their own two hands...or rather, into their six legs. Can they act like flies on the wall and find the culprits before it's too late?

The mad scientist Petty Potts has a crazy new formula—a spray that can turn Josh and Danny into lizards! The boys immediately give themselves a spritz and whizz up the nearest tree. But soon, they find themselves in deep doo-doo and surrounded by owls that eye them as snacks. Will Josh and Danny make it out in time?

Summer camp was going great for Josh and Danny until mad scientist Petty Potts showed up. Sure, her serum turned them into frogs to help them save their new friend Charlie. But the serum didn't completely wear off: all three kids still have frog feet!They are running out of time to find right antidote before their parents show up. Their best option is to ask Petty to use her S.W.I.T.C.H. formula again. But of course, things don't turn out quite as planned. Do two frogs and a newt st...