Three years have passed since Arthur has saved his grandparents home and saved the minimoys from the evil M known as Maltazard, Arthur stays with his grandparents for the holidays, during which the Bogo Matassalai (a fictitious African society) assign Arthur a series of tests including camouflage and environmental nonviolence. Having passed these tests, Arthur prepares to see the Minimoys to celebrate, until his father decides to take him and his mother back to the metropolis. When a spider gives Arthur a grain of rice containing a distress-call, which he believes has come from the Minimoys, he returns to his grandparents' house, where the Bogo Matassalai's attempt to give him Minimoy stature through a telescope fails, and they instead wrap him in vines of increasing tightness until he falls in a drop of sap into the Minimoy Max's bar. ''En route'' to investigate the Minimoys' condition, Arthur and Max rescue Betameche, who leads Arthur to the King. He then learns that Selenia is held by Maltazard, who is inspired to invade the human world by increasing his own size. Maltazard tricks the Minimoys into completing this design. The telescope itself is destroyed in the process, leaving Arthur trapped at his Minimoy size.