Taichi, Yamato, Koushiro, and Takeru are captured by Millenniumon's servant, Sephirotmon, who places them in battle against previously defeated foes. Devimon appears again. He confronts and nearly corrupts Angemon.
Parrotmon appears and joins the fight against MetalGreymon. Taichi and Agumon refuse to give up and continue to fight despite being outnumbered and in a disadvantage.
Millenniumon is finally revived. Taichi and Agumon have survived their encounter with Mugendramon. The Chosen Children are trapped. The holy digimons HolyAngemon and Angewomon must fulfill their role in the new war once again.
The Chosen Children and their Digimons are devastated because of the unknown fate of Taichi and WarGreymon. However, clocks are ticking and they need to overcome their sorrows and prevent the resurrection of Millenniumon.
Mimi and Palmon wander after falling into the ruins, coming across a deactivated Guardromon among piles of robotic Digimon parts whom Mimi express sympathy towards.
Inspired by the hopes of the Chosen Ones and world's children, Omegamon (the fusion of WarGreymon/ MetalGarurumon) breaks into the heart of Abaddomon to destroy the evil Digimon and end the Great Catastrophe once and for all
The Chosen Ones reunite after an SOS call from Gerbemon. Deathmon, the King of Army of Darkness from the ancient war appears, an omen for the Great Catastrophe. The Holy Digimons, inspired by hope and light of all Digimons step up to fight
Taichi's group travels through a cave only to find themselves in Tokyo, and notice that despite the previous problems everything seemed suspiciously normal.
By controlling the miasma, Devimon overpowers MetalGreymon and WereGarurumon. Meanwhile at the real world, Koshiro deduces that Calmaramon is sending massive amounts of data to the Digital World and that Taichi's group must be in trouble.