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Poyomon is a Slime Digimon. With a translucent body, it is a Digimon Baby that drifts through the "Net Ocean" like a jellyfish. As it has the most primitive structure among the Digimon discovered to date, it has been showered in attention as the "Missing Link", the key to solving the mystery of the origin of Digimon, by the scholars and enthusiasts studying the roots of Digimon.
In August 2010, a Poyomon's partner had his mind seized and interred within the Never World by Eosmon so that he can live within his memories with Poyomon. After Omnimon's defeat Poyomon holds Taichi "Tai" Kamiya down alongside a group of other Digimon so that he cannot continue to cause harm to their paradise, though Tai is able to break free and snaps all the Digimon and DigiDestined out of their brainwashing by blowing Kari Kamiya's whistle. After Agumon (Bond of Bravery) and Gabumon (Bond of Friendship) destroy the combined Eosmon's Mega form, he is freed and regains consciousness in the Real World.