Marvel Studios' Black Widow

Black Widow is the 2021 feature film based on the Marvel Comics character of the same name. The story takes place in the Marvel Cinematic Universe, but is set before the events of Avengers: Endgame where the character meets her apparent demise.

Scarlett Johansson reprises her role as Natasha Romanoff/Black Widow in Marvel Studios’ first solo outing for the character. The movie is set in a period after her time as a Russian agent, where she must return to the Soviet Union to deal with unfinished business. She reconnects with her sister, Yelena Belova (Florence Pugh) as well as parental figures Alexei Shostakov aka The Red Guardian (David Harbour) and Melina Vostokoff (Rachel Weisz). Together they must shut down "The Red Room," a training facility that converts women into killing machines, a facility run by the ruthless Taskmaster, an agent who has the abilities of Avengers like Captain America, Hawkeye and Black Panther.

Marvel Studios provides this vague synopsis:

In Black Widow, Natasha Romanoff aka Black Widow confronts the darker parts of her ledger when a dangerous conspiracy with ties to her past arises. Pursued by a force that will stop at nothing to bring her down, Natasha must deal with her history as a spy and the broken relationships left in her wake long before she became an Avenger.

The movie is directed by Cate Shortland from a script by Eric Pearson (Thor: Ragnarok), and produced by Kevin Feige, 

Black Widow is the first film in Phase Four of the Marvel Cinematic Universe.