When Beast finally developed a cure for the Legacy virus there was one problem; a mutant would have to give his life to activate the cure. Against the wishes of his fellow X-Men, Colossus injected himself with the cure so that no more mutants would have to die as his sister had. The X-Men found what appeared to be his lifeless corpse, and believed him dead.
This kinda sounds like what Wonderman went through when the Avengers thought he died, but was only in a comatose state.
In fact, an alien known as Ord abducted Colossus as he lay dying and resuscitated him. Ord kept Colossus imprisoned in a laboratory, using him as a guinea pig for tests to develop a 'cure' for the mutant gene. When the X-Men recently raided the lab, Kitty Pryde found and freed Colossus.
In the alternate history of the Ultimate X-Men series, Colossus was an arms dealer, sending the money back to his family in Russia. He joined the X-Men after he turned to steel in a barrage of gunfire. In the Ultimate War crossover with The Ultimates, Colossus fought Thor and had the upper hand against the thunder god.
Current Colossus would put up a good fight, but eventually lose. Ultimate Colossus on the other hand would defeat Abonimation in my opinion.