LEGO Black Widow is a line of LEGO sets based on the Marvel Comics character Black Widow, who is also known as Natasha Romanoff. Black Widow is a superheroine and a member of the Avengers, a team of superheroes who defend the world from various threats. The LEGO Black Widow sets are part of the LEGO Marvel Super Heroes theme, which includes a variety of sets based on Marvel Comics characters and storylines.
The LEGO Marvel Super Heroes theme is based on the characters created by Marvel Comics. Originally Marvel was a subtheme of the LEGO Super Heroes theme but was later separated into its own theme. Over time, sets in the Marvel Super Heroes theme includes most characters and situations released to the marvel Universe from films to the comics to TV series.