Scarlett Johansson

Johansson first appeared as Black Widow in 'Iron Man 2', marking the beginning of her long-term involvement with the Marvel Cinematic Universe.

Her role in 'The Avengers' further established her as a key figure in the MCU.

Johansson reprised her role as Black Widow in 'Captain America: The Winter Soldier', 'Avengers: Age of Ultron', 'Captain America: Civil War', 'Avengers: Infinity War', and 'Avengers: Endgame', contributing to the franchise's global success.

Johansson starred in the standalone film 'Black Widow', providing a deeper exploration of her character.