“Hail Hydra” is the salute used by the fictional terrorist organization of the Marvel Universe named Hydra and the opening line of the group’s official motto, which reads: “Hail Hydra! Immortal Hydra! We shall never be destroyed! Cut off one limb and two more shall take its place! We serve the Supreme Hydra, as the world shall soon serve us!”
I haven’t watched agents of S.H.I.E.L.D. yet but they used to go hard in the comics
Hydra is pretty strong…