Lister and Lester are identical twins who do identical things. But their constant striving to outdo each other means their little brother, Liam, is always left out. When Lester's Lemonade Universe and Lister's Lemonade Multiverse open for business, there's no role for Liam. He does odd jobs around the neighborhood while Lister and Lester's competition spirals into overdrive and their lemonade stands get increasingly, outrageously out of hand.