Candace vows to send a safety inspector to inspect Knickknack Toys. Jarvis goes above and beyond with his safety protocols, making everyone wear protective gear, and putting a hold on all toy inventing. But when Geneva accidentally turns Knickknack's modelling clay toy, Kooky-Dough, into self-replenishing dough, Piper is convinced they've got a huge hit toy on their hands. Jarvis, concerned about the inspection, wants them to shut the toy down. But just as the safety inspector arrives, the girls discover their dough is growing out of control!