Hydra: cut off one head, and two more take its place. By now, any Marvel fan knows the mantra that’s repeated in the Marvel Cinematic Universe. As one of the longest recurring villains on the screen for Marvel, Hydra got its start more than 50 years ago on the comic book page as a group bent on taking S.H.I.E.L.D. down.

Hydra was a villainous super group with a goal of nothing short of world domination when first introduced, and over time, some of its leaders became the biggest villains in Marvel Comics. It’s been through a lot of changes over the years, and ...

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