Avengers+
Guys, you're gonna wanna see this. [On the tablets he sends out synced videos of Peggy being catatonic, Sam falling asleep exactly when the attacks occur, the live attacks with timestamps, and Sam waking up when the attacks are over.]
I thought it was a coincidence with Bucky's bombings, but it happened twice last night, the two times match up from when Cap said that the alternate Natasha came and when Carter came. Carter went catatonic the moment Sam woke up. Also we just got the lab results back. Agent Carter doesn't have any human DNA either, but it doesn't stop there. It looks like she and Sam have the same exact DNA. To me, it looks like some sort of extraterrestrial being that behaves like some... humanoid shape-shifting fungus. I'm not sure how it's able to imitate our abilities or how it's able to know what we know. I especially don't understand how it got a hold of Thor's ax or Sam's suit or any of these things.
Its motive is still unclear, but I think we can be sure the genocide won't be over until we figure out how to kill this thing.