Petty Potts has vanished - at least it seems that way to Josh and Danny. In actual fact, she's just relocated her secret lab... to the very pink and very girly Princess Land! Reluctantly, the twins fight their way through hordes of excited girls dressed as fairies to the back of the shop, where a single door stands between them and Petty's new lab. SWITCH-ing into geckos, the boys have no problems getting under the door and up the walls. It's on the way out that things start to get really tricky.... The SWITCH back hasn't gone well, and although Josh and Danny have normal legs, they're giant geckos from the waist up! How on earth will they escape from Princess Land now?!