In Captain America: Civil War, Bucky apparently can run as fast as enhanced Steve Rogers.
I don’t remember anything specific about how Bucky gets extra power beyond the bionic arm (which, I’m assumig is made of vibranium?).
What’s the story behind that? The serum that makes Steve Rogers better was only used once, the only prior being the Red Skull, right?
We do see, in that incident, the Winter Soldier steal 5 blue vials that created the death squad, but they were tested against Bucky initially who seems to already have some kind of enhancement.