The Marvels teaser trailer debuts cosmic all-female team-up

This idea of replacing one person with another person in a different place and time seems to be a nod to the comic book roots. At one point in the original Captain Marvel stories which starred Mar-Vell, he was trapped in the Negative Zone until Rick Jones swapped places with him (usually via the Nega-bands) when the hero was needed.

Another interesting plot development in this teaser is the mention of S.A.B.E.R. In the Marvel Comics, the agency that deals with interstellar threats is S.W.O.R.D., which is an offshoot of S.H.I.E.L.D. In the MCU, S.W.O.R.D. was first mentioned in a deleted scene from Thor: The Dark World (2013). S.W.O.R.D. would later be fully introduced in WandaVision (2021). But it appears the MCU is expanding or replacing S.W.O.R.D. with S.A.B.E.R., which appears to be specifically created for The Marvels film.

We also see the return of Samuel L. Jackson's Nick Fury to the big screen. The rest of the teaser shows glimpses of the situations the three super-heroes will be pitted against, including the return of the Kree Empire, Kamala Khan's family, and more of Goose and his race of cat-like Flerken.

https://www.youtube.com/watch?v=iuk77TjvfmE The Marvels teaser also came with an updated synopsis at the official website:

In The Marvels, Carol Danvers aka Captain Marvel has reclaimed her identity from the tyrannical Kree and taken revenge on the Supreme Intelligence. But unintended consequences see Carol shouldering the burden of a destabilized universe. When her duties send her to an anomalous wormhole linked to a Kree revolutionary, her powers become entangled with that of Jersey City super-fan Kamala Khan, aka Ms. Marvel, and Carol's estranged niece, now S.A.B.E.R. astronaut Captain Monica Rambeau. Together, this unlikely trio must team up and learn to work in concert to save the universe as "The Marvels."

The Marvels stars Brie Larson, Teyonah Parris, Iman Vellani, Samuel L. Jackson, Zawe Ashton, and Park Seo-joon. Directed by Nia DaCosta, The Marvels hyper-jumps into theaters on November 10, 2023.