Moon=Millenniummon (Adventure:)

Moon=Millenniummon is an antagonist from the series Digimon Adventure:. It was the weapon of the Dark Digimon.

Story
Before the DigiDestined arrived in the Digital World, ZeedMillenniummon was a pure destructive force that was responsible for the deaths of countless Digimon during the ancient war between good and evil Digimon. It served as a weapon for the Dark Digimon Army. However, they were unable to control its power, forcing, , , , , , , and to sacrifice themselves in order to defeat it.

ZeedMillenniummon's body was shattered into several dark crystals that spread across the Eternal Continent and the Cloud Continent. The smallest crystal also contained its soul, Moon=Millenniummon, which was used by and  for digivolution. The largest dark crystal, FAGA, was located in the Sealed Grounds and guarded by several, who were Millenniummon's worshippers. Because of the dark crystals, the black lightning began to strike the Eternal Continent, sending data stolen from the Internet to the dark crystals, which direct it forward to FAGA, so it can be used for creation of a new body for Millenniummon.

Devimon first used Moon=Millenniummon against the DigiDestined, when made SkullKnightmon digivolve into. When facing the DigiDestined himself, Devimon also combines Moon=Millenniummon's power with the data sent by Calmaramon to digivolve itself into. And after NeoDevimon's defeat, AxeKnightmon used it to digivolve NeoDevimon into.

After DanDevimon's death, AxeKnightmon took the crystal with him to the Eternal Continent in attempt to sacrifice itself and kidnapped for a ritual to send their data to FAGA and restore Millenniummon's body. During the ritual, AxeKnightmon broke the crystal containing Moon=Millenniummon, but destroyed AxeKnightmon, saved Kari and, forcing Moon=Millenniummon escape to FAGA. Moon=Millenniummon remained in FAGA until the crystal fused with, restoring Millenniummon to a new body.

ZeedMillenniummon
ZeedMillenniummon is one of Moon=Millenniummon's Mega forms.

In the past, ZeedMillenniummon was once the Dark Digimon's ultimate weapon, but they were unable to control it due to its immense power. However,, , , , , , , and defeated it by sacrificing themselves.