Hiro and his friends are in the Digital World trying to uncover the truth when they come up against a powerful Digimon. This Digimon, Bloomlordmon, is too powerful and Gammamon turns to the darkness within.

Caught in a cunning trap by Regulusmon, Siriusmon appears to be on the verge of death. Hiro has to risk everything to save his virtual little brother. What ending awaits them?