Ethan Hunt while vacationing, is alerted by the IMF that someone has used his identity to assist Russian bio-chemical expert Dr. Vladimir Nekhorvich of Biocyte Pharmaceuticals to enter the United States, only to kill him in a subsequent plane crash. Nekhorvich, an old friend of Ethan, had forewarned the IMF of his arrival, planning to deliver a new bioweapon, Chimera, and its cure, Bellerophon, both of which he was forced to develop by Biocyte, into the IMF's hands. With his death, IMF is worried that the virus is out in the open, believing that rogue IMF agent Sean Ambrose is responsible. IMF assigns Ethan to recover it. Ethan is told that he can use two members of his team to help him, but the third person to help him must be Nyah Nordoff-Hall, a professional thief presently operating in