Having killed Black Widow Natasha Romanoff in Zurich, the
SHIELD team quietly leaves; Daredevil calls her at this moment and the rival Black Widow, Yelena Belova, answers Nat's phone.
Belova explains that Natasha is dead (kicking her body into the lake) and DD
gives her the intel: US and Russian military forces have been dispatched to
Rhapastan to prevent the use of the bio-toxin and Black Widow must get there
first to protect the soldiers from the toxin....
At his lab in Zurich, Dr Ines
receives a call asking him if he has discovered an antidote for the bio-toxin.
No, but he has created a vaccine. His mystery caller tells him to send the
vaccine to Colonel Khan in Rhapastan and then go into hiding....
At the army base, Belova sets off
explosions and then hijacks a truck for her escape but she is captured by
Colonel Khan himself. He mocks her efforts to prevent his using the toxin on
his enemies—he was planning to use it on his own troops, killing them but
creating a horrifying reputation for himself and his army. She is tied up and
left under guard in a tent....
Meanwhile, a nurse (face covered
by a niqab but we know it is Natasha) has come to treat the unit's burn
victims; the Colonel orders all the men to report to her for a vaccine against
burn-related infections. When Belova escapes, Natasha drops her disguise and
hurries after her, restraining her to a) explain that she faked her death with
some friends in stolen SHIELD uniforms and rubber bullets just to get away from
her shadow and b) let Belova provide a distraction while she carried out her
plan—which includes vaccinating her rival. Russian military forces arrive and
Colonel Khan orders the bio-toxin released. But Natasha had inoculated the
troops against it; only Khan himself was not treated. He turns into a superstrong
madman and goes after the Russians; Natasha engages him until the serum finally
kills him. Belova tries to kill her rival but Natasha knows that Belova looks
forward to meeting and defeating her enemy in the future. Natasha allows Belova
to make her escape while reporting to the Americans the outcome of the mission.