In the Ultimate Marvel universe, Peter Rasputin reluctantly works as an arms smuggler for the Russian mob. Peter was saved from a firing squad as a young child by a boss in the Russian Mafia called Big Boris, who smuggles Peter from Siberia to the United States. Colossus' powers are similar to those of his Earth-616 counterpart. With the use of a deadly drug called Banshee, he has gained super strength to rival other powerhouses such as Thor. He is not immune to Rogue's touch as shown in the "Return to Weapon X" storyline. He is also highly resistant to physical injury. He has withstood being slashed by Ultimate Wolverine's adamantium claws. He has also survived a localized nuclear explosion. A few deviations from the Earth-616 version include the fact that Ultimate Colossus's height remains the same when he changes. Unlike the mainstream version, his eyes remain vulnerable to pressure even in steel form, as shown when fighting Sam Wilson during "Ultimate Nightmare".