Ross Collins

After accidentally drinking some of mad scientist Petty Pott's SWITCH potion while at school, twins Josh and Danny become grasshoppers and this time they may not change back without help.

"... the beady-eyed, green-tongued witch Truda Hangnail spreads evil along her path to succeed Queen Bluebell, enlisting the kingdom's rats and shrinking the good witches of Wadingburn to pave her way to the throne. Luckily, a sweet-natured orphan named Loobly is witness to Truda's evil spells and sets off to fetch help."--Jacket flap. When the quill writes "Go Go Go" frantically on the wall, and the House of the Ancient Crones heaves Gracie Gillypot...

When their sister, Jenny, is accidentally turned into a crane fly by Petty Potts' SWITCH spray, twins Josh and Danny must transform themselves, as well, and rescue her before she burns her legs off.

When planning for Cockenzie Rood Day, Prince Albion gets kidnapped because a zombie wants to play his fiddle in the talent contest. Trueheart, a prince and Gubble the troll must stop the zombie before real damage is done to the Five Kingdoms.

During an unwelcome visit, neighbor Tarquin unwittingly uses SWITCH spray to turn twins Josh and Danny into ants, then sets out with a magnifying glass to fry some bugs.

When Petty Potts disappears, twins Danny and Josh search her secret laboratory and house, where they find an irresistible bottle of S.W.I.T.C.H. spray, and later they find themselves on a live television talk show.

While on vacation with their parents in Cornwall, twins Danny and Josh follow clues to another marble but find themselves trapped by the tide on a rocky island and the only way back is to use some pilfered REPTOSWITCH.

Twins Josh and Danny continue following clues leading them to marbles filled with scientific code, despite the fact that mad scientist Petty Potts' REPTOSWITCH formula is having some very strange side-effects.

Twins Danny and Josh are having a miserable time at camp when mad scientist Petty Potts arrives, armed with her new AMPHISWITCH formula, just in time to get another camper out of trouble.

At the zoo, twins Josh and Danny willingly try out Petty Pott's new REPTOSWITCH formula and enjoy being snakes until they are spotted by a group of girls on a field trip, including their camp friend, Charlie.