You say billions of years in existence?
Thought they originated in Japan?
nah, The Hand worship a demon called The Beast.
The Beast may or may not be one of the fallen angels/watchers.
the folks who started worshiping him predate humanity and were killing stuff cause fukk God.
That's how The Hand started
I only know about the Iron Fist Netflix version. But I thought they originated in Iron Fist's dimension.
Hydra is my pick. The way they ran thru the buildings in Winter Soldier and AoS was.
MCU wise, sure.
comics wise, nah.

You say billions of years in existence?

.
how you had the skrull as your leader and none of y'all suspected shyt until she got killed and everyone stopped fighting, fury was the only one who suspected anything iron Man was losing his mind. 

