Arthur 3: The War of the Two Worlds (French: Arthur 3: La Guerre des deux mondes) is a 2010 English-language French fantasy animated/live-action directed and co-written by Luc Besson, based on the fourth book of the Arthur children's books series by Besson. It is the sequel to Arthur and the Revenge of Maltazard (2009) and the third installment in the Arthur film series. The film was shot back-to-back with the previous installment. In the U.K. and Ireland, this and the predecessor were edited together into one film known as Arthur and the Great Adventure.

Plot

Picking up after the second film, Maltazard has assumed human size, and left Arthur in miniature. Accompanied by Princess Selenia and her brother, Prince Betameche, Arthur attempts to retrieve an enlarging potion from his house, which Maltazard seizes to enlarge his followers, whereafter Arthur returns to human form using an Elixir of Life given by a queen bee. Archibald convinces Darkos, Maltazard's son, to change sides, and enlarges him with a second potion. Arthur and Darkos then confront Maltazard, until Selenia and Betameche shrink Maltazard back to his Minimoy size and Arthur captures him, while the U.S. Army overcome Maltazard's forces. Maltazard thereafter remains a prisoner of Arthur's family.