(ベーダモン（X抗体） Vademon (X-Antibody))
Vademon X is an Alien Digimon and a carrier of the X Antibody. It is shaped like something that came from the far reaches of the cosmos, but it's rumored that it was born from the seed of a plant. It could not be imagined from its overdeveloped head and octopus-like lower body, but it carries terrifying offensive power. Due to the X-Antibody, it became the "Defective Alien". Unlike the other Vademon which came in order to invade the Earth, it appears in a shape which has an adverse effect on Earth culture. It thinks that it is the stronger digivolution, but that is only looks, as it's hard for it to see the truth through its sunglasses. However, it is able to master skills which menace enemy Digimon, and is perhaps a step closer to invading the Earth.
- Akuma no Nage Kiss (悪魔の投げキッス? lit. "Demon's Blown Kiss"): Makes a complete fool out of the opponent by blowing them a kiss before hurling meteors and planets at them.
- Abduction Kousen (アブダション光線? lit. "Abduction Ray"): Fires a beam from the ray gun in its hand.
- Tenshi no Low Kick (天使のローキック? lit. "Angel's Low Kick"): Smiles while it kicks the opponent's feet, completely distracting them.
Vademon X is an altered version of Vademon.
- Vademon (X-Antibody) (ベーダモン（X抗体）)
Official romanization given by the Digimon Reference Book and used in the franchise. English media shortens "X-Antibody" to "X".