Colossus is Piotr Rasputin. He is a mutant. He is originally from Russia and related to Grigori Rasputin the famous historical figure.His mutant power is the ability to turns himself into a man made of iron. Under that form, he has super-strength.Colossus fights crime as a member of the X-Men.He is Shadowcat's boyfriend.He often uses his strength to perform the Fastball Special, where he grabs Wolverine and uses his strength to hurl him at enemies in the same way a baseball pitcher performs a fastball.