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S04:E28 - Darkness Before the Dawn
It's bad enough when Mercurymon corners you in a world of mirrors and beats you up but then he uses Seraphimon's data to turn into ShadowSeraphimon. It looked really bad for Takuya but energy from Seraphimon's Digi-Egg let Takuya Fusion Evolve to Aldamon, who kicked the fractal code out of ShadowSeraphimon and Mercurymon. Takuya returned to the others and the Digi-Egg finally hatched but inside was only a Patamon. And what good is that little guy gonna be against all the forces of darkness?