Mercurymon appears in front of Takuya and challenges him to a fight, Takuya accepts, turning into Agunimon, he tries to fight him, but they're both in an area made by steel and mercury, the best battlefield for Mercurymon. Eventually they leave into a place that resembles a church, and Mercurymon uses the data of Seraphimon to turn into a ShadowSeraphimon. ShadowMercurymon was beating Takuya hard, Takuya was even sure he had to give up. But energy from Seraphimon's Digi-Egg let Takuya Fusion Evolve to Aldamon, was able to defeat the ShadowSeraphimon and take back Seraphimon's data. Mercurymon went back to the previous battlefield, but Aldamon easily defeated him. Takuya returned to the others and the Digi-Egg hatched into Patamon.