Serum Which Initiates Total Cellular Hijack gets twins Danny and Josh turned into bugs. Their mad scientist neighbor, Petty Potts, gets them to help with her crazy top-secret experiments. In this six book series she turns them into spiders, blue-bottle flies, grasshoppers, ants, crane flies and beetles. Spring is in the air and insects will be returning so what better series to start than S.W.I.T.C.H and enjoy the adventures of the nutty scientist Petty Potts and her neighbors, twins Josh and Danny. Start at the beginning with Spider Stampede by Ali Sparkes.