It's Holly and Rose's birthday - and they're having a party at Fitzroy Castle. Not only is there a real castle, there's a bouncy castle, too. But not even the twins' party is safe from the wicked Party Poopers. How will they get rid of these troublemakers whilst making sure their guests have a good time? With the help of the Little Sparkles, of course! Here's Tikki the yellow kitten, Peppy the light-blue puppy, Bubbles the pink bunny, Princess the white pony and Tubbs the rainbow-coloured turtle - and they're going to make the party perfect!