In the first scene of Ant-Man,
Hank Pym storms into a room where there are three people: Mitchell Carson, Howard Stark, and a woman.
Who is the woman?
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Here’s a screen cap from the opening scene:
The actress is Hayley Atwell (albeit with heavy makeup to give the impression of age). She’s shown up a few times in the MCU, including Captain America: The First Avenger and Agent Carter.
In Agent Carter, we see her involved with the SSR, which eventually becomes SHIELD. This includes working with Howard Stark, who’s with her in the early Triskelion. As such, it’s not surprising that we’d see her in a meeting of senior SHIELD members.
The three people are Mitchell Carson, Howard Stark, and Margaret "Peggy" Carter. You may have seen her as a young woman in Captain America: The First Avenger or in the TV show Marvel's Agent Carter and as a 92-year-old woman during Captain America: The Winter Soldier.
Peggy Carter is portrayed by actress Hayley Atwell.