text: Legacy Virus Distraught by the death of his little sister Illyana by the Legacy Virus, Mikhail decided to do something. Mikhail goes back and exposes his sister to the virus when she is in her aged form, thinking that with her magical abilities it would shield her from harm and help her to build an immunity. It was later revealed that Mikhail himself was suffering from the disease and was also trying to rid his body of the fatal virus. However, his plan backfired, and Illyana contracted the disease, her brother having been the one to administer it to her.
  The Twelve
  When Professor X temporarily disbanded the X-Men, Colossus took Marrow with him to Boston to see an art expo. While there, they were transported to the Hill by Mikhail Rasputin, and Colossus came face-to-face with his brother for the first time since his supposed suicide. The pair of X-Men ended up freeing Mikhail from the corrupting influence of a sentient energy native to that dimension and brought him back to the X-Mansion to recuperate when the entire team became embroiled in the gathering of the Twelve.
  Mikhail was one of the Twelve, and one of the Horsemen breached the mansion's security to kidnap him. Colossus joined a strike force of X-Men who traveled to Egypt in order to confront Apocalypse, and his Skrull allies. In the resulting battles, Mikhail sacrificed himself to carry the Horsemen away from the conflict in a dimensional gateway. Although some Horsemen have reappeared since then, Mikhail did not reappear until X-Men: Colossus- Bloodline.