|Real name||Piotr Rasputin|
|First appearance||"X-Men #1"|
Working with Chameleon
Piotr was a street-thief in Russia, until he was found by Dmitri Smerdyakov. The two became partners in crime and they were famous. Eventually, Piotr got tired of being a thief. He left Dmitri and went to America.
Piotr joined the X-Men where he befriended Nightcrawler and Kitty Pryde. He assisted in defeating Sebastian Shaw. When Magneto and several students left, Piotr remained loyal and stayed at the school.
Dmitri came to America and found Piotr. He blackmails him into robbing the Triskellion. However, he alerts the X-Men and Chameleon was arrested. However, as consequence for his actions, Piotr was asked to leave the X-Men.
After he left, Colossus began freeing mutants the MRD had captured. When they raided the X-Mansion he was able to rescue Nightcrawler and Kitty. The three of them broke into the MRD base and freed everyone else. Professor X welcomed Colossus back onto the X-Men because of his good deeds. At first he declined, but Kitty convinced him he should.