The New Avengers
Real Name: Piotr (Peter) Nikolaievitch Rasputin
Occupation: (current) Adventurer, student, (former) Artist, adventurer
Former Occupation: Subversive, second-in-command of Factor Three
Other Aliases: (former) Peter Nicholas, The Proletarian
Legal Status: Russian citizen, now living in the United States under a special arrangement made for him by Professor Charles Xavier, with no criminal record; now naturalized American citizen
Place of Birth: Ust-Ordynski Collective, near Lake Baikal, Siberia, Union of Soviet Socialist Republics
Place of Death: Institute for Higher Learning
Marital Status: Single
Known Relatives: Nikolai Rasputin (father, deceased), Alexandra Rasputina (mother, deceased), Illyana Nikolovna Rasputina (anglicized to Rasputin, also known as Magik, sister, deceased), Mikhail Rasputin (brother, deceased)
Base of Operations: (current) Professor Charles Xavier's Institute for Higher Learning, Salem Center, Westchester County, New York at time of his death (former) Muir Isle, Scotland,; a loft in Soho, Manhattan, Ust-Ordynski Collective, Lake Baikal, Siberia, U.S.S.R., X-Men Headquarters in Australian outback
Group Affiliation: (former) Excalibur, (at time of death) X-Men
First Appearance: GIANT-SIZE X-MEN #1
Final Appearance: UNCANNY X-MEN #390
Height: (normal) 6 ft. 6 in. (armored) 7 ft. 5 in.
Weight: (normal) 250 lbs. (armored) 500 lbs.
Eyes: Blue, (transformed) Silver
Strength Level: In his normal human form Peter Rasputin possesses the normal human strength of a man of his age, height, and build who engages in intensive regular exercise. As Colossus he can left (press) at least 70 tons under optimal conditions.
Special Skills: Talented artist in drawing and painting
Known Superhuman Powers: Colossus is a mutant with the superhuman ability to convert the tissue of his entire body into an organic steel-like substance, granting him superhuman strength and a high degree of resistance to bodily harm. This substance, resembling organic steel, is of unknown composition but appears to be analogous to osmium and to carbon steel. He is able to transform into this armor-like state at will (the process is virtually instantaneous) and remain in that form for an as yet undetermined amount of time. (The longest time he has remained in armored form so far has been five days). Once in his armored form he remains so until he consciously wills himself back to normal. If he is rendered unconscious, however, he spontaneously reverts to his normal form. While in his armored state, Colossus possesses the same degree of mobility that he does in his normal form.
The process by which Colossus transforms himself to armored form and back (including his gain of additional mass from an unknown, perhaps extra-dimensional, force) remains unknown. Colossus cannot become partially or selectively armored; his body is either entirely converted or not. Even his eyes become steel-like; his eyeballs can withstand and deflect the impact of a .45 caliber bullet.
In his armored form Colossus is highly resistant to most forms of bodily harm. His armor is capable of withstanding ballistic penetration, including that of a 110 millimeter Howitzer shell. He could survive a collision with a loaded, one-ton flatbed truck at 100 miles per hour or an explosion of 450 pounds of TNT. He can survive extremes of temperature from 70 degrees above absolute zero (-390 degrees Fahrenheit) to approximately 9000 Fahrenheit. However, it is theorized that above the latter temperature, his armored form would begin to melt. Colossus's armored form cannot rust under normal Earth conditions.
Colossus is in unusually fine physical health, permitting the transition back and forth from his normal organic flesh state to his armored form to occur with minimal stress on his system. His normal lungs are capable of holding his breath for 3.6 minutes. In the past he has exhibited a minimal or nonexistent need to breathe while in his armored state. However, it is believed that he could not survive for long in a vacuum. His endurance and speed are somewhat greater in his armored form.