Colossus is a Marvel Comics character who is a Russian mutant that is part of the X-Men. He has the ability to transform his whole body into an "organic steel". When transformed, he gains increased height and weight. He has super human strength, stamina and durability. Colossus appears at the end of episode 20 of Marvel Disk Wars: The Avengers. He was seen coming off the Blackbird with fellow X-Men Storm and Iceman in order to help their fellow X-Men Cyclops and Wolverine in defeating Baron Zemo.
Colossus was created by Len Wein and Dave Cockrum.