Grandland is a city dominated by one man, Alex Grand, the owner of the factory that produces Genex 100, the only available food. One day, Theo and his friends go on a school visit to the factory and accidentally discover the terrible truth about the foods
The heroes reach the Yellow Kingdom and find a population enslaved by the powerful Ty-Paw. With his army of Tykers he forces the farmers to hand over their harvest of grains. Theo can’t accept the injustice and encourages the farmers to revolt.
To mend the farmers’ bones and help free the Yellow Kingdom, Theo, Lena and Ben need hundreds of liters of milk.
The heroes return to the Yellow Kingdom to help the farmers but they soon discover that most of the population has fled into the mountains in fear.
On their way to the Orange Kingdom, the heroes mistakenly stumble into the addictive Sugar Kingdom.
Ben is stuck in the Sugar Kingdom and needs saving. That’s why Theo, Lena and Nina have to trust Sid and accompany him back to the Orange Kingdom where they can prepare a magic potion to help free Ben.
The heroes and Sid return to the Sugar Kingdom, unaware they are being followed by Alex Grand, Nose and some of the G-Squads. Whilst Alex tries to discover the secret of sugar hypnosis, the heroes try to find and free Ben.
The antenna which sends out hypnotic rays over the Sugar Kingdom must be destroyed. But this antenna is guarded in an iron capsule attached to the ceiling of the Candy Bowl stadium.
The “Roller Heroes” have reached the semifinals of the Candy-Bowl, along with Alex Grand’s “G-Squad” team.
The “Roller Heroes” play the Candy Bowl finals against the Kingdom’s favorites, the “Gladiators”. But the greedy villain, Candyman, will do anything to stop the heroes winning and reaching the iron capsule.
Alex Grand has seized the hypnotizing antenna and returned to Grandland. But before that, he managed to leave the heroes in the Sugar Kingdom, locked in the iron capsule with no food.
The heroes arrive in the Red Kingdom and encounter a land full of castles, princesses and mysterious knights. In this medieval world, they discover new powers to combat the terrible Alex Grand.
To protect the Red Kingdom from the destructive power of the fearful dragon, the heroes have to take part in dangerous challenges and fierce jousting tournaments. But the greatest danger of all may come from where they least expect it...
In the midst of battles and betrayals, the heroes gain the help of an unexpected ally but lose the Nutri-Pad. Alex offers a reward for their capture and in their escape, the heroes venture into the slippery Kingdom of Fats.
Even with all the guards from the Kingdoms of the Round Knights out hunting for them, the heroes have to walk into a trap and take part in the dangerous Rally of the Fried Kingdom, if they want to recover the Nutri-Pad.
Alex Grand is furious and decides to burn all the Kingdoms of the Round Knights with the dragon’s fire. Now, the heroes have to race against time to avoid the catastrophe.
Alex Grand orders the dragon to destroy the Kingdom of Meat. Whilst Lena, Nina and Genevieve help Guardian Red’s army defend the Kingdom, Theo and Ben embark on a dangerous flight to break Alex’s control over the Dragon.
Alex Grand wants to destroy the meat at all costs. That’s why he returns to Grandland and gathers an army of G-Squads to attack the Red Kingdom. Whilst Lena, Ben and Nina help Guardian Red prepare the defenses.
In order to rescue Guga Purple from the Dragon’s Lair, Theo, Genevieve, Guga Red and Nose have to cross a jungle inhabited by pre-historic animals. Lena, Ben and Nina remain with Guardian Red to try to stop Alex and his army of G-Squads.
Alex Grand and the G-Squads have practically destroyed the whole of the Red Kingdom. Guardian Red, Fit Phil, Lena, Ben and Nina try desperately to protect the people and the last remaining food.
Before setting out on the quest for the next Kingdom, Theo, Lena, Ben and Nina need to get hold of a new food that is guarded in the Grand Corporation. But Alex is ready for them with a cunning plan to stop the heroes who, it seems, are not even safe.
Arriving in the Brown Kingdom, the heroes are caught up in a war between American Indians and Cowboys. Before they can reach the legumes, they first have to prove they are true Indian warriors. Meanwhile, Alex gets his hands on a secret diary.
Lena has to follow her instincts and pass a difficult test to save her friends. Together, they journey through dangerous territory to free the Indian tribe from an ancient curse.
Amidst horseback riding, rodeos and risky adventures in the Cowboys’ Far West, Theo, Ben and Nina finally meet Guardian Brown. But in order to unite the vegetables with the rest of the foods, the heroes first have to get the Indians and Cowboys.
The heroes are in a race against time to stop the war between the Indians and Cowboys. But now, without the help of Johnny the Kid and Nina who have mysteriously disappeared.
Alex Grand arrives in the Brown Kingdom in the midst of a fierce battle between the Indians and Cowboys. And he’s not alone. With him is a weapon with the power to destroy all the legumes!
Amidst the ruins of the Brown Kingdom, chaos reigns. The legumes have been destroyed and the Indians and Cowboys, desperate for food, fight to take the Nutri-Pad from the heroes. Alex Grand returns home triumphant.
The heroes depart full steam ahead on a train packed with Cowboys and the last remaining legumes. Their destination is the Red Kingdom. But the journey is beset by perils, including a flying machine piloted by Nose.
On their way to the Red Kingdom, the heroes realize their train is about to be flattened by Alex Grand’s huge Imperial Express. A terrifying, high-speed train chase begins, in which it seems that all the endeavours of the heroes.