After a curious young student named Jason meets Isobel - a mysterious transfer student who joins his class, Jason discovers the existence of talking miniature cars called Mecardimals. Isobel tries to keep them a secret but is surprised to learn that Jason has already befriended his own Mecardimal, who seems to be on a mission.

The combined power of the 30 Mechanimals finally wakes up the ultimate Mechanimal, Megadragon. The Mechanimals have lost all of their energy and are unable to move, and Black Mirror orders Gryphinx to dispose of him. That's when Mega Dragon radiates with dazzling light...