Known Superhuman Powers: The Iceman is a mutant with the superhuman ability to lower his external and internal body temperature, projecting intense coldness from his body. Like any normal human being's, the nerve centers for regulating the Iceman's body temperature are found in the part of the brain called the hypothalamus. However, the Iceman can mentally override his hypothalamus to allow his body temperature to be lowered by an unknown internal mechanism. This ability converts the latent thermal energies in and around his body into an unknown form of energy that is efficiently dissipated. A related mutation has rendered his body tissues unaffected by sub-zero temperatures. The Iceman can consciously, immediately lower his body temperature from its normal 98.6 Fahrenheit to that of -105.7 F within the span of a few tenths of a second.
As his body temperature falls, the surrounding moisture in the air that is in contact with him is similarly lowered. Just as condensed moisture forms frost, this moisture forms an icy covering which encompasses his entire body. It also obscures his facial features. When the Iceman first began to completely lower his body temperature, this covering took on a more snow-like appearance. But as he learned to increase the severity of his coldness, the covering assumed the consistency of crystalline ice that it has today. This ice constantly cracks with any movement of his body, and immediately reforms. (Hence, there is a cracking sound when the Iceman, covered with ice, moves.) Through practice, the Iceman has learned to control the intensity of his coldness, and he can selectively lower the temperature of isolated parts of his body.
The Iceman can use his mutant ability to freeze any local air moisture into super-hard ice. This ice can be formed into any object of his choosing: the only limitations are his own imagination, his skill as a sculptor, the amount of available moisture, and the ambient air temperature which determines how long his ice sculpture will stay icy. He does not have to hold the ice physically with his hands in order lo shape it. Apparently he can simply direct the waves of coldness he projects in certain ways so as to create ice in the shape he desires. In the past, the Iceman has formed ice-ladders, ice-slides, ice-shields, and ice-bats.
The Iceman is able to form a rising column of ice beneath his feet, capable of lifting him off the ground. The tensile strength of the column is determined by its thickness, and its steadiness by how well it has been braced. A well-braced and regular column, 6 feet in diameter at its base, is able to support his weight without toppling for about 85 feet in a 20-mile per hour wind. By forming long ice-ramps connected either to his ice-column or to an existing structure like a building or a bridge, the Iceman is able to travel above the ground by sliding down the ramp he is creating. Unless he creates supports periodically, the ramp will crack beneath him, unable to support their combined weight.
Theoretically, the Iceman has an almost unlimited supply of moisture at all times since it is always present in the surrounding air or environment. Even desert air has sufficient moisture content for him to make practical use of, although the process takes somewhat longer. However, the mental effort needed to employ his mutant power can eventually fatigue him and render his freezing ability temporarily disfunctional.
Like that of any trained athlete, the Iceman's ability to perform is directly related to his daily physical health and current mental state. Under normal conditions, he can usually form ice continually for a period of about 3 hours before becoming exhausted.