Secret Invasion is an upcoming Marvel series on Disney Plus set in the MCU – starring Samuel L. Jackson, Emilia Clarke and Ben Mendelsohn.
Clark Gregg uploaded a post to his Instagram story in September 2021, with the caption ‘Secret work’. Gregg is being covered in a silicone mask mold; to get the shape of his face.
Clark Gregg’s Instagram story
If this is for Secret Invasion, this mold of his face being made could imply, that Clark Gregg’s character Phil Coulson may be showing up as a Skrull.
Deleted Imdb Lists
In August 2021; there were also credits posted on IMDB for Series Transportation Department and Series Additional Crew. The unconfirmed actors mentioned there: Anthony Mackie, Iman Vellani, Michael B. Jordan, Jonathan Majors, Clark Gregg and Tom Hiddleston. They were all removed about two weeks later.
Production List

This production list further supports these actors mentioned in the deleted IMDB list; to make cameos, except Clark Gregg and Tom Hiddleston are not written in here. This description included is likely taken from the comics rather than the show.
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