Ultimate Doom is a scientific genius, though unlike Richards he approaches science as an art rather than as a system. While the Fantastic Four's powers are compared to the four classical Greek elements, Doom has attained the power of one of the additional Chinese elements, metal - his body is almost completely solid metal, possessing no discrete internal organs, somewhat similar to Colossus (though Doom cannot switch back to a flesh-and-blood form). In his first post-transformation encounter with the Fantastic Four, he expelled the remains of his internal organs as a poisonous gas. He can grow and fling porcupine -like volleys of metal spikes from his forearms, and also possesses a regenerative power, but he cannot heal any wound caused by his own body. Thus, the scar Reed made on Doom's face remains, because it was done with one of his own spikes. Doom exhibits super strength as well, as he is able to break the arms off the zombie version of Ben Grimm. The creature Doom summoned selected his body as the most powerful it could find, passing up Thor and Thing.