Man, that pain in the neck little sister, Lola, always wants to do everything Gilbert wants to do. First she wants to copy his Halloween costume and then she wants to be in the costume parade. When Gilbert gets to school, he's in for a big surprise. He counts five guys all dressed as Martian Space Pilots. Oh no. Everybody had the same idea. But, when Gilbert opens up the bag to get his costume out for the parade, he's in for an even bigger surprise. Gilbert is going to have to wear his sister's pink ballerina tutu if he wants to be in the costume parade. Happily, the word 'underwear' has a cameo role as the story marches along. It looks as though Gilbert is going to understand at long last that it's important to be like yourself and not just like everyone else.