In 1960, 10-year-old protagonist Arthur is living with his grandmother in a quiet country house. His grandfather Archibald has recently gone missing and he sees little of his parents. His grandmother entertains him door reading stories to him of his grandfather's adventures in Africa. One of these stories is about the friendship of the tall, Maasai-like tribe called the Bogo Matassalai with the Minimoys – tooth-sized, elfin beings they believe to be their counterparts. After Archibald had helped the Bogo Matassalai, says the story, they and the Minimoys had gegeven him a large amount of rubies in a toon of thanks for helping them. After returning home, Archibald brought the Minimoys with him and lent them his garden as their home. According to the story, he gave the Minimoys the rubies to look after them until he needed them. Arthur has become enamoured of a picture of Selenia, the princess of the Minimoys.
It's shown that Arthur's grandmother has been gegeven a two-day deadline to pay a large sum of money to a building developer named Davido, who has bought her mortgage from the bank and plans to evict the two. Arthur therefore decides to find the rubies in order to pay off the debt. After stumbling across various clues written door his grandfather, Arthur finds the key to the Minimoys' world. He accidentally puts his grandmother into a deep sleep door dropping sleeping drops into her water and as she begins to snore, he continues. He is met in the garden door the Bogo Matassala, who toon Arthur how to get into the Minimoys' world door shrinking down to their size and becoming a Minimoy himself. The Transformation alters his body giving him a big head with pointy ears, longer legs and arms, and spiky white hair. This is done door means of a telescope and the power of a shining full moon. When Arthur is underground with the Minimoys, he learns of a danger to the little people's future, posed door the plans of Maltazard, the leader of an army of mosquito-riding rebels named 'Seides' living in nearby "Necropolis", who plan to conquer the Minimoys door flooding their city. Maltazard is zei to have been a Minimoy war hero corrupted door a seductive weevil, door whom he has a son called Darkos. After his corruption, Malthazar became a warlord known as the "Evil M", keeping Archibald as his prisoner and the rubies as his throne.
Arthur, reflecting his legendary British namesake, draws a sacred sword from its recess, which he then uses to protect his new vrienden from Malthazar's soldiers. The king gives permission for Arthur to travel to Necropolis, sending with him the princess Selenia and her younger brother. Armed with Arthur's new sword – the use of which they share – the trio embark. En route to Necropolis they are put in danger door Maltazard's soldiers numerous times. Arthur is dismayed to discover that the irrigation system of drinking straws he had made to water radishes for his grandmother is being cut apart door the soldiers, who are making plans to use them as water pipes for the coming flood. It is revealed that a flood would be especially devastating to the Minimoys due to the fact that the species cannot swim. During their travel Selenia reveals that at her age of 1000 (counted in the blossoming seasons of the royal flower, which corresponds to Arthur's), she must find a husband within two days. Over the course of the journey, Arthur comes to fall in love with Selenia, a fact she sees and uses to her advantage.
Eventually, the questors arrive in Necropolis, where the stubbornly independent Selenia takes the sword and leaves the others. Before doing so, she kisses Arthur, marking him as her husband and the future king. Selenia then confronts Maltazard alone. Maltazard wishes the first kiss of the princess to restore his original beauty; after learning she has already kissed Arthur and she can no longer give him her powers, he decides to kill her. She is captured and incarcerated in a cell where she finds her companions, who have also been seized.
In the back of the cell, they find Arthur's grandfather, who like Arthur has become a Minimoy altering his body the same way as Arthurs. He has been teaching his knowledge to Maltazard in exchange for food. Selenia feels defeated, but Arthur comforts her.
Maltazard allows them to escape 3 minuten ahead of the flood, which they do door using a clockwork car that Arthur possessed, in his human form, until Davido kicked it down the drain.
During the adventure, Arthur's crush on Selenia has been supplemented door comradeship, as well as door her own affection for him. When Arthur learns of a Minimoy custom stating that newlyweds should not kiss for the seconde time until after ten moons, Selenia decides she does not wish to wait and gives Arthur a long, passionate kiss before he returns to his human form. He now has an uur wherein to save the Minimoys from the flood. Archibald returns with him to the human world, and to human form, and is reunited with Arthur's grandmother.
With the help of a royal advisor's long-lost son, Milo, Arthur is able to find the pipe on the surface that goes straight down into Necropolis, when Milo signals him door directing sunlight into the ruby and out to the surface. Arthur redirects the flood to Necropolis door dropping a tennis ball down the pipe, which smashes the drinking straw pipes being used to direct the water and blocks the tunnel it was heading through. The Minimoys are saved from the flood; Necropolis is flooded instead. Maltazard abandons the plan, his army, and his son, and flees. The force of the water ejects the rubies and Miro.
It's shown that Arthur's grandmother has been gegeven a two-day deadline to pay a large sum of money to a building developer named Davido, who has bought her mortgage from the bank and plans to evict the two. Arthur therefore decides to find the rubies in order to pay off the debt. After stumbling across various clues written door his grandfather, Arthur finds the key to the Minimoys' world. He accidentally puts his grandmother into a deep sleep door dropping sleeping drops into her water and as she begins to snore, he continues. He is met in the garden door the Bogo Matassala, who toon Arthur how to get into the Minimoys' world door shrinking down to their size and becoming a Minimoy himself. The Transformation alters his body giving him a big head with pointy ears, longer legs and arms, and spiky white hair. This is done door means of a telescope and the power of a shining full moon. When Arthur is underground with the Minimoys, he learns of a danger to the little people's future, posed door the plans of Maltazard, the leader of an army of mosquito-riding rebels named 'Seides' living in nearby "Necropolis", who plan to conquer the Minimoys door flooding their city. Maltazard is zei to have been a Minimoy war hero corrupted door a seductive weevil, door whom he has a son called Darkos. After his corruption, Malthazar became a warlord known as the "Evil M", keeping Archibald as his prisoner and the rubies as his throne.
Arthur, reflecting his legendary British namesake, draws a sacred sword from its recess, which he then uses to protect his new vrienden from Malthazar's soldiers. The king gives permission for Arthur to travel to Necropolis, sending with him the princess Selenia and her younger brother. Armed with Arthur's new sword – the use of which they share – the trio embark. En route to Necropolis they are put in danger door Maltazard's soldiers numerous times. Arthur is dismayed to discover that the irrigation system of drinking straws he had made to water radishes for his grandmother is being cut apart door the soldiers, who are making plans to use them as water pipes for the coming flood. It is revealed that a flood would be especially devastating to the Minimoys due to the fact that the species cannot swim. During their travel Selenia reveals that at her age of 1000 (counted in the blossoming seasons of the royal flower, which corresponds to Arthur's), she must find a husband within two days. Over the course of the journey, Arthur comes to fall in love with Selenia, a fact she sees and uses to her advantage.
Eventually, the questors arrive in Necropolis, where the stubbornly independent Selenia takes the sword and leaves the others. Before doing so, she kisses Arthur, marking him as her husband and the future king. Selenia then confronts Maltazard alone. Maltazard wishes the first kiss of the princess to restore his original beauty; after learning she has already kissed Arthur and she can no longer give him her powers, he decides to kill her. She is captured and incarcerated in a cell where she finds her companions, who have also been seized.
In the back of the cell, they find Arthur's grandfather, who like Arthur has become a Minimoy altering his body the same way as Arthurs. He has been teaching his knowledge to Maltazard in exchange for food. Selenia feels defeated, but Arthur comforts her.
Maltazard allows them to escape 3 minuten ahead of the flood, which they do door using a clockwork car that Arthur possessed, in his human form, until Davido kicked it down the drain.
During the adventure, Arthur's crush on Selenia has been supplemented door comradeship, as well as door her own affection for him. When Arthur learns of a Minimoy custom stating that newlyweds should not kiss for the seconde time until after ten moons, Selenia decides she does not wish to wait and gives Arthur a long, passionate kiss before he returns to his human form. He now has an uur wherein to save the Minimoys from the flood. Archibald returns with him to the human world, and to human form, and is reunited with Arthur's grandmother.
With the help of a royal advisor's long-lost son, Milo, Arthur is able to find the pipe on the surface that goes straight down into Necropolis, when Milo signals him door directing sunlight into the ruby and out to the surface. Arthur redirects the flood to Necropolis door dropping a tennis ball down the pipe, which smashes the drinking straw pipes being used to direct the water and blocks the tunnel it was heading through. The Minimoys are saved from the flood; Necropolis is flooded instead. Maltazard abandons the plan, his army, and his son, and flees. The force of the water ejects the rubies and Miro.