Wolverine Vol.1 #21,66-68,128,145-146,159,176
Wolverine Vol.3 #25,42
Colossus real name is Piotr "Peter" Nikolaievitch Rasputin. Colossus was born in Siberia in the now dissolved USSR. Colossus was recruited to jion the X-Men at the same time as Wolverine. Using his ability to transform into organic-steel, Colossus fought side-by-side with Wolverine for many years and is one of the closest friends. They share a long and enduring friendship which has seen them through many adventures. Colossus left the X-Men for a brief time, but came back as a member as Excalibur. Colossus gave his life to cure the the Legacy Virus.