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.
Arriving in the Brown Kingdom, the heroes get caught up in a war. Before they can reach the legumes, they first have to prove they are true warriors. Meanwhile, Alex gets his hands on a secret diary.
Lena must follow her instincts and pass a difficult test to save her friends. Together, they journey through dangerous territory to free a tribe from an ancient curse.
Theo, Ben and Nina at last meet Guardian Brown amidst horseback riding, rodeos and risky adventures in the Cowboys' Far West. The heroes try to unite the vegetables with the rest of the foods.
Chaos reigns amidst the ruins of the Brown Kingdom. The legumes have been destroyed and a fight ensues to take the Nutri-Pad from the heroes. Alex Grand returns home triumphant.
The heroes depart 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.
