Piotr Rasputin also known as Colossus is a fictional superhero appearing in American comic books published by Marvel Comics, commonly in association with the X-Men. Created by writer Len Wein and illustrator Dave Cockrum, he first appeared in Giant-Size X-Men #1 (May 1975). A Russian mutant, the character is a member of the X-Men, and is by far the physically strongest member of the team, being able to transform into a strong metallic form. Even without his powers he holds a physically imposing figure standing at 6'7 (200 cm). Throughout the series he has been portrayed as a quiet, honest and innocent man. He has had a fairly consistent presence in X-Men-related comic books since his debut. A talented artist, he only reluctantly agrees to use his powers in combat, feeling it is his responsibility to use his abilities for the betterment of human and mutant-kind.Colossus is a mutant that has the ability to transform his entire body into a form of organic steel , with properties similar to osmium but of still unknown composition. Colossus must transform his entire body into this armored state; he cannot transform only a portion of his body. When he transforms, he gains around a foot in height (official figures say about 7'5 feet tall in transformed state versus 6'6 feet in normal human form) and his weight is at least doubled. In his armored form, Colossus possesses superhuman levels of strength, as well as superhuman stamina and durability