Join Batman and Harley Quinn as they go head-to-head in this fun-packed LEGO activity set.Buster Books (Author) Buster Books loves to create books for curious and creative children, which spark the imagination and encourage exploration. Above all, they are books to be enjoyed.LEGO (Author) The LEGO Group’s mission is to inspire and develop the builders of tomorrow through the power of play. The LEGO System in Play, with its foundation in LEGO bricks, allows children and fans to build and rebuild anything they can imagine.