Rotten to the Digi-Core! Digimon Fusion : Season 2 Episode 21

In an attempt to save his friends, Mikey allows Axeknightmon to extract his Digi-Core and is sent to the dreaded Holding Cell of Prison Land. There, he comes face to face with the cores of the seven Dark Generals, who are only too happy to band together and defeat the Fusion Fighter General.