Harry is trying to draw a castle, but is having trouble getting his pencil to draw a straight line. In the hope that Dino World may be able to offer a solution, Harry and the Dinos disappear through the bucket and discover a set of ready-drawn straight lines and the perfect blank space to draw a castle! They all work together to build a spectacular castle, but when they step inside, they discover somebody else has already done the decorating…They soon realise that the mysterious interior designer is called Silly Pencil and he can draw anything in a flash, granting wishes and wreaking havoc at the same time!