When Charles Xavier founded the X-Men, Colossus joined them and together they fought for a future where humans and mutants could coexist in peace.
After some time, the X-Men reached their goal and they became media heroes. Colossus, along with the other X-Men, was put in the Danger Room by Forge to fight against a simulated version of the Hellfire Club as training.
When the X-Men were attacked and almost slaughtered by the Followers of Apocalypse, Colossus was injured during the battle and was dragged away from danger by Shadowcat, even though Colossus was telling her that they must stay and fight and help the others. It is unknown if Colossus survived the battle.