Arthur 3 The War of the Two Worlds - With Maltazard now 7 feet tall and Arthur still 2 inches small, our hero must find a way to grow back to his normal size ans stop the Evil M once and for all, with the help of Selenia and Betameche. Maltazard, the Evil M, is now 7 feet tall and evolving among the humans, causing terror wherever he goes. His goal is simple: forming an army of giant henchmen and ruling over the universe. Meanwhile, Arthur is still a Minimoy, and thus in a state where he's unable to fend him off. With the help of Selenia and Betameche, he hatches a plan to regain his usual size: all they must do is infiltrate Arthur's house through the pipeworks, catch an electric train from his bedroom to his grandfather's study and find an elixir that will make him grow back to his human size. Sounds simple enough, if it weren't for Darkos, Maltazard's own son, hot on their tails.

Arthur answers a distress call from Princess Selenia, who is menaced by the nefarious Maltazard. Arthur did as a boy what only grandpa, a fellow nature buff, did as an adult: pass, as white man, the Bogo tribe's tests of harmony with the natural worlds of trees, minerals and animals. To answer a mysterious call fro help from the Mimimoy people, he enters their world miniaturized. By the time he works out with friends it was a trick, the mastermind has already escaped, ready to strike in our world.

Ten-year-old Arthur, in a bid to save his grandfather's house from being demolished, goes looking for some much-fabled hidden treasure in the land of the Minimoys, a tiny people living in harmony with nature. Arthur is a spirited ten-year old whose parents are away looking for work, whose eccentric grandfather has been missing for several years, and who lives with his grandmother in a country house that, in two days, will be repossessed, torn down, and turned into a block of flats unless Arthur's grandfather returns to sign some papers and pay off the family debt. Arthur discovers that the key to success lies in his own descent into the land of the Minimoys, creatures no larger than a tooth, whom his grandfather helped relocate to their garden. Somewhere among them is hidden a pile of rubies, too. Can Arthur be of stout heart and save the day? Romance beckons as well, and a villain lurks. (Rip by Ahsoka)