The Tweenies decide it would be great fun to be each other, so they swap clothes. Fizz pretends to be Jake, Milo pretends to be Fizz, Bella decides to be Milo and Jake says that he will be Bella. Doodles tries to be Izzles, Izzles is Judy, and Max gets very confused.

Judy asks a long list of questions when she visits the Science Museum.

The Tweenies learn about goats and play with a pretend troll called Bogsnort.