Jayce's father, Audric, worked to create a plant that would feed the world, but just as he succeeded, radiation changed his creation into plants with evil brains that use up the minerals and water of the planets. Audric then developed a good plant to destroy the evil ones. Audric makes Jayce Oon's master and sends Oon to find him to give him the root of the good plant. Thus Jayce starts the quest to find his father with the help of a magical ring of great power and the Wheeled Warriors - vehicles of great power, all given to him by the magician Gillian. Jayce, Oon, Gillian, and Flora escape the garden with the help of Herc, the mercenary pilot of his own ship, The Pride. Saw Boss and the other evil plants called monster minds are prepared to pursue Jayce to destroy him and the root.