Mission: Impossible 2

In Sydney, bio-genetics scientist Doctor Vladimir Nekhorvich sends a message to the IMF for Dimitri (Ethan Hunt's cover name), warning that his employer, Biocyte Pharmaceuticals, forced him to develop a biological weapon known as the Chimera virus to profit from its cure, Bellerophon. He injects himself with the virus, and departs for the CDC headquarters in Atlanta. En route, rogue IMF agent Sean Ambrose disguised as Dimitri steals the Bellerophon and escapes, using sleeping gas to crash the plane into the Rockies, killing all aboard.
In Seville, IMF director Swanbeck informs Ethan about Ambrose's actions and tasks him with recovering Chimera and Bellerophon, and has him recruit Nyah Nordoff-Hall, a professional thief and Ambrose's ex-girlfriend. Despite her initial reluctance, Ethan gets her to trace Ambrose to Sydney using an injectable tracking device. Ethan assembles his team, old friend and computer hacker Luther Stickell, and helicopter pilot Billy Baird in Sydney while Nyah pretends to rekindle her relationship with Ambrose.
After Ambrose uses a video of Chimera infecting one of Nekhorvich's colleagues to blackmail Biocyte's CEO, John McCloy, into cooperation, Nyah gives Ethan the memory card containing the video, revealing that Chimera has a 20-hour dormant period; Bellerophon is only effective if used within that window. Ethan's team kidnaps McCloy and learns that Ambrose holds the last Bellerophon samples. Ethan breaks into Biocyte headquarters and destroys two samples of Chimera, but Ambrose's team ambushes him, having discovered Nyah's deception. At a stalemate, Ambrose orders Nyah to retrieve the virus' last sample, but she injects herself with it instead and begs Ethan to kill her to destroy the virus. Ethan refuses and flees the facility, promising to get her the cure.
Ambrose releases Nyah to wander the streets of Sydney, intending to start a pandemic. At Biocyte's storage facility on Bare Island, he offers to sell Bellerophon to McCloy in exchange for enough stock options to make him Biocyte's majority shareholder, enabling him and McCloy to make billions. Ethan infiltrates the base and fights Ambrose's right-hand man, Hugh Stamp; Stamp seemingly brings a subdued Ethan to Ambrose, who executes him. However, Ambrose discovers that the dead "Ethan" is a disguised Stamp and that the actual Ethan has fled with the Bellerophon samples. Enraged, Ambrose and his men chase Ethan onto the mainland; Hunt evades capture, while Luther and Billy locate Nyah, who has wandered to a cliffside to commit suicide and prevent the outbreak.
Ethan kills Ambrose in an extended fistfight on the beach and gives Bellerophon to the arriving Luther, who injects Nyah with it. In return for her cooperation, the IMF clears Nyah's criminal record, and Ethan starts a vacation with her in Sydney.