A fancy dress party is being held for some children, where Thomas shall be giving them rides. Thomas wonders deeply about what he could possibly wear as a costume. Upon being given a good clean at the Washdown, Thomas comes up with the idea of going as a giant bubble bath! But his “bubble” is soon burst when he ends up crashing into Toby the Tram Engine, due not being able to see through the soap in his eyes! After two more incidents still, the first involving getting cloaked in toffee apple and the other getting covered in leaves and nasty branches, Thomas is in quite a state. But little does he know that his state will turn out all for the better.