The first teaser trailer for The Marvels has been released, and it showcases a bit of how the film will unite three generations of Marvel heroines. There's still a lot that's unknown about the film, however, namely its central conflict and villain. Said villain is briefly shown in the trailer, but she's perhaps one of the deepest cuts yet in the Marvel Cinematic Universe.
Source:https://www.cbr.com/the-marvels-villain-dar-benn-explained/