The US army's tactical network had been corroded by Digimon, causing military systems to go haywire. Taichi and the others fight desperately against the enemy Digimon in order to put an end to the threat of the missile launch, however the more enemy Digimon they defeat, the more they evolve. And finally, the missiles are launched at Tokyo. Furthermore, bullets of light fired by the enemy Digimon hit Greymon and Garurumon directly. Then, an enormous white Digimon appears... !?

The battle between Greymon and Orgemon ended abruptly and now the Chosen Ones discuss their next move. Taichi and Agumon take a chance to defeat the ultimate enemy, so that the others can safely head to their next destination.

Taichi’s team finds a strange cave that leads to Tokyo. Excited to be back, the children attempt to get home through the subway. However, a creepy Digimon prowls the city, and there, the children learn a shocking truth.

Thanks to Takeru’s bravery, Taichi and the others found the way into the castle where the Digitama is held. As for the Chosen Ones in Tokyo, they were in a remote battle against Calamaramon to stop an uncontrollable tanker from crashing.

Taichi and Agumon act as bait so that the jungle’s Digimon can safely escape. However, Metalgreymon’s attacks are useless against the new Mega Digimon that stands in their way.